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61-484: Outlook Express is a different application from Microsoft Outlook . The two programs do not share a common codebase, but they do share a common architectural philosophy. The similar names lead many people to conclude incorrectly that Outlook Express is a stripped-down version of Microsoft Outlook. Outlook Express uses the Windows Address Book to store contact information and integrates tightly with it. Version 1.0

122-420: A mail retrieval agent . Although the retrieval agent uses a client protocol, this forwarding resembles server forwarding in that it keeps the same message-identity. Concerns about the envelope-sender apply. An end-user can manually forward a message using an email client . Forwarding inline quotes the message below the main text of the new message, and usually preserves original attachments as well as

183-425: A proprietary email attachment format called Transport Neutral Encapsulation Format (TNEF) to handle formatting and other features specific to Outlook such as meeting requests. Outlook Express and other email clients are unable to read this format. This can be confusing to Outlook Express users (as well as those who use other email clients) who receive attachments sent from Outlook. Outlook Express has been prone to

244-773: A stand-alone application ; organizations can deploy it as multi-user software (through Microsoft Exchange Server or SharePoint ) for shared functions such as mailboxes , calendars , folders , data aggregation (i.e., SharePoint lists), and as appointment scheduling apps . Other than the paid software on Windows and Mac desktops that this article talks about, the Outlook name also covers several other current software: Outlook has replaced Microsoft's previous scheduling and email clients , Schedule+ and Exchange Client . Outlook 98 and Outlook 2000 offer two configurations: Perpetual versions of Microsoft Outlook include: Includes iOS and Android support Microsoft Outlook

305-517: A "secure" form on Microsoft Azure servers located in the United States. On Exchange accounts, these servers identify as a single Exchange ActiveSync user in order to fetch e-mail. Additionally, the app does not support mobile device management , nor allows administrators to control how third-party cloud storage services are used with the app to interact with their users. Concerns surrounding these security issues have prompted some firms, including

366-1342: A built-in Junk Mail filter. Service Pack 2 has augmented these features and adds an anti- phishing filter. Outlook add-ins are small additional programs for the Microsoft Outlook application, mainly purposed to add new functional capabilities into Outlook and automate various routine operations. The term also refers to programs where the main function is to work on Outlook files, such as synchronization or backup utilities . Outlook add-ins may be developed in Microsoft Visual Studio or third-party tools such as Add-in Express. Outlook add-ins are not supported in Outlook Web App . From Outlook 97 on, Exchange Client Extensions are supported in Outlook. Outlook 2000 and later support specific COM components called Outlook Add-Ins. The exact supported features (such as .NET components) for later generations were extended with each release. In March 2016, Salesforce announced that its relationship intelligence platform, SalesforceIQ , would be able to seamlessly integrate with Outlook. SalesforceIQ works from inside

427-412: A choice of selected headers (e.g. the original From and Reply-To .) The recipient of a message forwarded this way may still be able to reply to the original message; the ability to do so depends on the presence of original headers and may imply manually copying and pasting the relevant destination addresses. Forwarding as attachment prepares a MIME attachment (of type message/rfc822 ) that contains

488-524: A dedicated spell checker. It used the spell checkers from Microsoft Office if Office was also installed. However, the Office 2007 spell checkers, except for the French spell checker, were incompatible with Outlook Express. Microsoft acknowledged this problem, but did not provide any sort of remedy. There were third party files that fixed the issue, but Microsoft never took action. Cancelling sending an email while it

549-452: A group-style conversation. The app lets users create groups, mention their contacts, share Office documents via OneDrive and work on them together, and participate in an email conversation. The app also allows the finding and joining of other Outlook Groups. It was tested internally at Microsoft and launched September 18, 2015, for Windows Phone 8.1 and Windows 10 Mobile users. After its initial launch on Microsoft's own platforms they launched

610-556: A large number of different e-mail services and platforms, including Exchange , iCloud , Gmail , Google Workspace (formerly G Suite), Outlook.com , and Yahoo! Mail . The app supports multiple email accounts at once. Emails are divided into two inboxes: the "Focused" inbox displays messages of high importance, and those from frequent contacts. All other messages are displayed within an "Other" section. Files, locations, and calendar events can be embedded into email messages. Swiping gestures can be used for deleting messages. Like

671-572: A message got relayed from one SMTP server to another. Even if the system discouraged the use of source-routing, dynamically building the return-path implied that the "envelope sender" information could not remain in its original form during forwarding. Thus RFC 821 did not originally allow plain message-forwarding. The introduction of the MX record made source-routing unnecessary. In 1989, RFC 1123 recommended accepting source-routing only for backward-compatibility. At that point, plain message forwarding became

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732-468: A message. However, annoying misconfigured vacation autoreplies do reach authors. Typically, plain message-forwarding does alias-expansion, while proper message-forwarding, also named forwarding tout-court serves for mailing-lists. When additional modifications to the message are carried out, so as to rather resemble the action of a Mail User Agent submitting a new message, the term forwarding becomes deceptive and remailing seems more appropriate. In

793-560: A more standards-compliant email client since the release of Outlook 2007. Outlook and Exchange Server internally handle messages, appointments, and items as objects in a data model which is derived from the old proprietary Microsoft Mail system, the Rich Text Format from Microsoft Word and the complex OLE general data model. When these programs interface with other protocols such as the various Internet and X.400 protocols, they try to map this internal model onto those protocols in

854-596: A number of problems which can corrupt its files database, especially when the database increases in size due to an increasing number of stored emails and during database compaction. This has led to a thriving market for software that can back up, restore and recover corrupted files. An open-source project called UnDBX was also created, which seems to be successful in recovering corrupt databases. Microsoft has also released documentation which may be able to correct some non-severe problems and restore access to email messages, without resorting to third-party solutions. Outlook Express

915-415: A proprietary Microsoft communications protocol that was formerly used by Hotmail. Email forwarding Email forwarding generically refers to the operation of re-sending a previously delivered email to an email address to one or more different email addresses. The term forwarding , used for mail since long before electronic communications, has no specific technical meaning, but it implies that

976-540: A service licensing program that makes Office programs available as soon as they are developed). Outlook for Mac 15.3 improves upon its predecessors with: The "New Outlook for Mac" client , included with version 16.42 and above, became available for "Early Insider" testers in the fall of 2019, with a public "Insider" debut in October 2020. It requires macOS 10.14 or greater and introduces a redesigned interface with significantly changed internals, including native search within

1037-462: A source of many security problems. Formerly only trusted users could utilize the command-line switch for setting the envelope sender, -f arg ; some systems disabled this feature for security reasons. Email predates the formalization of client–server architectures in the 1990s. Therefore, the distinction between client and server seems necessarily forced. The original distinction contrasted daemons and user-controlled programs which run on

1098-425: A source-route, indicating that each host had to relay the mail to the next host on the list. Otherwise, in the case of insufficient destination-information but where the server knew the correct destination, it could take the responsibility to deliver the message by responding as follows: The concept at that time envisaged the elements of the forward-path (source route) moving to the return-path (envelope sender) as

1159-486: A typical example of server-based forwarding to different recipients. Email administrators sometimes use the term redirection as a synonym for server-based email-forwarding to different recipients. Protocol engineers sometimes use the term Mediator to refer to a forwarding server. Because of spam , it is becoming increasingly difficult to reliably forward mail across different domains, and some recommend avoiding it if at all possible. Plain message-forwarding changes

1220-557: A way that can be reversed if the ultimate recipient is also running Outlook or Exchange. This focus on the possibility that emails and other items will ultimately be converted back to Microsoft Mail format is so extreme that if Outlook/Exchange cannot figure out a way to encode the complete data in the standard format, it simply encodes the entire message/item in a proprietary binary format called Transport Neutral Encapsulation Format (TNEF) and sends this as an attached file (usually named "winmail.dat") to an otherwise incomplete rendering of

1281-453: Is a personal information manager software system from Microsoft , available as a part of the Microsoft 365 software suites. Though primarily being popular as an email client for businesses, Outlook also includes functions such as calendaring , task managing , contact managing , note-taking , journal logging , web browsing , and RSS news aggregation . Individuals can use Outlook as

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1342-575: Is a holdover from the Internet Mail and News era. Like Internet Explorer, Outlook Express 4 can run on Mac System 7, OS 8, and OS 9. Internet Explorer 5 required Outlook Express 5 to save Web Archive files (see MHTML ). Outlook Express 6 is the last version of the software with Outlook branding. It has a similar layout to Outlook Express 5. It was included with Windows XP. Builds of "Outlook Express 7" appeared in early builds of Windows Vista when in development as "Longhorn". It relied on WinFS for

1403-548: Is an email and personal information manager software primarily used in professional settings. As part of the Microsoft Office suite , it offers email management, contact storage, calendar scheduling, and task tracking. Outlook can function independently or as part of a larger Microsoft ecosystem, including integration with SharePoint for file sharing. While it stores email data locally for offline access, newer versions restrict link opening to Microsoft's own browsers. Privacy

1464-461: Is being sent would not effectively prevent it from being sent. Similarly, when importing .PST files, cancelling the import while it was in progress merely canceled the import of the current folder and the import resumed with the next folder. Furthermore, Outlook Express only supported .dbx files that were smaller than 2 GB, and had performance problems when dealing with files approaching that limit. Microsoft Outlook Microsoft Outlook

1525-461: Is described in RFC 1847. When replying or forwarding a message to a user who has a digital signature, Outlook Express gives an error and does not allow the user to continue if there is no digital signature installed for the sender. Outlook Express does not have a documented object model like Microsoft Outlook. Programmatic access to, or control of Outlook Express for custom messaging applications or plugins

1586-721: Is designed to consolidate functionality that would normally be found in separate apps on mobile devices, similar to personal information managers on personal computers . It is designed around four "hubs" for different tasks, including "Mail", "Calendar," "Files" and "People". The "People" hub lists frequently and recently used contacts and aggregates recent communications with them, and the "Files" hub aggregates recent attachments from messages, and can also integrate with other online storage services such as Dropbox , Google Drive , and OneDrive . To facilitate indexing of content for search and other features, emails and other information are stored on external servers. Outlook mobile supports

1647-412: Is not documented nor guaranteed; the format saw over 10 versions released since version 1 in 2008. The standard .eml format replicates the format of emails as used for transmission and is therefore compatible with any email client which uses the normal protocols. Standard-compliant email clients, like Mozilla Thunderbird , use additional headers to store software-specific information related e.g. to

1708-572: Is not officially documented or supported by Microsoft. IStoreNamespace and IStoreFolder interfaces were documented in 2003, but they are only related to the storage. Some companies have managed to create their plugins hacking the interface using Windows hooks . A significant one was the PGP plugin because it was the only example of a working plugin whose source code was available (licensed under GPL ). By 2003, some companies provided commercial solutions to develop add-ins. Outlook Express did not have

1769-653: Is severely degraded in latest versions, as new Outlook sends passwords, mails and other data to Microsoft. Outlook 2002 introduced these new features: Outlook 2003 introduced these new features: Features that debuted in Outlook 2007 include: Features that debuted in Outlook 2010 include: Features that debuted in Outlook 2013, which was released on January 29, 2013, include: Features that debuted in Outlook 2016, include: Features that debuted in Outlook 2019, include: Microsoft made several versions of Outlook for older Mac computers, but only for email accounts on specific company servers ( Exchange ). It wasn't part of

1830-549: Is the first native version of Outlook for MacOS . Outlook 2011 initially supported Mac OS X's Sync Services only for contacts, not events, tasks or notes. It also does not have a Project Manager equivalent to that in Entourage. With Service Pack 1 (v 14.1.0), published on April 12, 2011, Outlook can now sync calendar, notes and tasks with Exchange 2007 and Exchange 2010. On October 31, 2014, Microsoft released Outlook for Mac (v15.3 build 141024) with Office 365 (a software as

1891-550: The European Parliament , to block the app on their Exchange servers. Microsoft maintains a separate, pre-existing Outlook Web Access app for Android and iOS. Outlook Groups was a mobile application for Windows Phone , Windows 10 Mobile , Android and iOS that could be used with an Office 365 domain Microsoft Account, e.g. a work or school account. It is designed to take existing email threads and turn them into

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1952-514: The Sender Policy Framework (SPF), the domain-name in the envelope sender remains subject to policy restrictions. Therefore, SPF generally disallows plain message-forwarding. In case of forwarding, the email is being sent from the forwarding server, which is not authorized to send emails for the original sender's domain. So the SPF will fail. Intra domain redirection complies with SPF as long as

2013-481: The Outlook inbox providing data from CRM , email, and customer social profiles. It also provides recommendations within the inbox on various aspects like appointment scheduling , contacts, responses, etc. Microsoft Outlook Hotmail Connector (formerly Microsoft Office Outlook Connector ), is a discontinued and defunct free add-in for Microsoft Outlook 2003, 2007 and 2010, intended to integrate Outlook.com (formerly Hotmail) into Microsoft Outlook. It uses DeltaSync ,

2074-400: The application for Android and iOS on September 23, 2015. Outlook Groups was updated on September 30, 2015, that introduced a deep linking feature as well as fixing a bug that blocked the "send" button from working. In March 2016 Microsoft added the ability to attach multiple images, and the most recently used document to group messages as well as the option to delete conversations within

2135-426: The application programme. Outlook Groups was retired by Microsoft on May 1, 2018. The functionality was replaced by adding the "Groups node" to the folder list within the Outlook mobile app. Outlook 2007 was the first Outlook to switch from Internet Explorer rendering engine to Microsoft Word 2007 's. This meant that HTML and Cascading Style Sheets (CSS) items not handled by Word were no longer supported. On

2196-412: The body of signed messages inline. Users get a filled email and one attachment (one of the message text and one of the signature) and therefore need to open an attachment to see the email. If the email has been forwarded several times, users need to open attached email messages one inside the other multiple times to reach the parent email message. This bug has still not been rectified. The proper behavior

2257-658: The client that no longer depends on macOS Spotlight . Some Outlook features are still missing from the New Outlook client as it continues in development. To date, the Macintosh client has never had the capability of syncing Contact Groups/Personal Distribution Lists from Exchange, Microsoft 365 or Outlook.com accounts, something that the Windows and web clients have always supported. A UserVoice post created in December 2019 suggesting that

2318-481: The desired effect. Some HTML attributes help achieve proper rendering of e-mails in Outlook, but most of these attributes are already deprecated in the HTML 4.0 specifications (1997) . In order to achieve the best compatibility with Outlook, most HTML e-mails are created using multiple boxed tables, as the table element and its sub-elements support the width and height property in Outlook. No improvements have been made towards

2379-523: The desktop Outlook, Outlook mobile allows users to see appointment details, respond to Exchange meeting invites, and schedule meetings. It also incorporates the three-day view and "Interesting Calendars" features from Sunrise. Files in the Files tab are not stored offline; they require Internet access to view. Outlook mobile temporarily stores and indexes user data (including email, attachments, calendar information, and contacts), along with login credentials, in

2440-407: The early 1980s was sendmail , which provided for ~/.forward files, which can store the target email-addresses for given users. This kind of server-based forwarding is sometimes called dot-forwarding . One can configure some email-program filters to automatically perform forwarding or replying actions immediately after receiving. Forward files can also contain shell scripts , which have become

2501-663: The email could cause code to run without the user's knowledge or consent. Outlook Express uses Internet Explorer to render HTML email. Internet Explorer has been subjected to many security vulnerabilities and concerns. With Outlook Express SP2 (part of Windows XP SP2), Microsoft has tried to correct the security holes. Outlook Express now blocks images inside emails by default. It uses only the restricted security zone for HTML email, which disables scripts and imposes restrictions on what web content can be rendered. It also warns when opening potentially malicious attachments. Outlook Express does not correctly handle MIME , and will not display

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2562-476: The email has been moved "forward" to a new destination. Email forwarding can also redirect mail going to a certain address and send it to one or more other addresses. Vice versa, email items going to several different addresses can converge via forwarding to end up in a single address in-box. Email users and administrators of email systems use the same term when speaking of both server-based and client-based forwarding. The domain name (the part appearing to

2623-602: The envelope recipient(s) and leaves the envelope sender field untouched. The "envelope sender" field does not equate to the From header which Email client software usually displays: it represents a field used in the early stages of the SMTP protocol, and subsequently saved as the Return-Path header. This field holds the address to which mail-systems must send bounce messages — reporting delivery-failure (or success) — if any. By contrast,

2684-414: The full original message, including all headers and any attachment. Note that including all the headers discloses much information about the message, such as the servers that transmitted it and any client-tag added on the mailbox. The recipient of a message forwarded this way may be able to open the attached message and reply to it seamlessly. This kind of forwarding actually constitutes a remailing from

2745-605: The local storage of the email, while keeping the file plain-text, so that it can be read in any text editor and searched or indexed like any document by any other software. As part of its Trustworthy Computing initiative, Microsoft took corrective steps to fix Outlook's reputation in Office Outlook 2003. Among the most publicized security features are that Office Outlook 2003 does not automatically load images in HTML emails or permit opening executable attachments by default, and includes

2806-873: The mail/item. If the recipient is Outlook/Exchange it can simply discard the incomplete outer message and use the encapsulated data directly, but if the recipient is any other program, the message received will be incomplete because the data in the TNEF attachment will be of little use without the Microsoft software for which it was created. As a workaround, numerous tools for partially decoding TNEF files exist. Outlook does not fully support data and syncing specifications for calendaring and contacts, such as iCalendar , CalDAV , SyncML , and vCard 3.0. Outlook 2007 claims to be fully iCalendar compliant; however, it does not support all core objects, such as VTODO or VJOURNAL. Also, Outlook supports vCard 2.1 and does not support multiple contacts in

2867-464: The management and storage of contacts and other data. The final version of Vista included a successor to Outlook Express known as Windows Mail (Vista) . Beginning with the text-based Unix Mail command , email traditionally used the inline or bottom posting styles when replying to messages. Outlook Express, as well as Lotus Notes and Microsoft Outlook, top-post (show replies newest to oldest) by default. Microsoft Outlook and Microsoft Exchange use

2928-494: The missing functionality be added has shown a "Planned" tag since October 2020. In March 2023, Microsoft announced that Outlook for Mac will be available for free. This means that users no longer need a Microsoft 365 subscription or an Office licence to use the program. First released in April 2014 by the venture capital -backed startup Acompli , the company was acquired by Microsoft in December 2014. On January 29, 2015, Acompli

2989-564: The other hand, HTML messages composed in Word look as they appeared to the author. This affects publishing newsletters and reports, because they frequently use intricate HTML and CSS to form their layout. For example, forms can no longer be embedded in an Outlook email. Outlook for Windows has very limited CSS support compared to various other e-mail clients. Neither CSS1 (1996) nor CSS2 (1998) specifications are fully implemented and many CSS properties can only to be used with certain HTML elements for

3050-425: The points of view of the envelope-sender and of the recipient(s). The message identity also changes. RFC 821, Simple Mail Transfer Protocol , by Jonathan B. Postel in 1982, provided for a forward-path for each recipient, in the form of, for example, @USC-ISIE.ARPA, @USC-ISIF.ARPA: Q-Smith@ISI-VAXA.ARPA — an optional list of hosts and a required destination-mailbox. When the list of hosts existed, it served as

3111-424: The recommended action for alias-expansion. In 2008, RFC 5321 still mentions that "systems may remove the return path and rebuild [it] as needed", taking into consideration that not doing so might inadvertently disclose sensitive information. Actually, plain message-forwarding can be conveniently used for alias expansion within the same server or a set of coordinated servers. The reference SMTP implementation in

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3172-430: The regular Microsoft Office package for Mac. Microsoft Entourage was Microsoft's email app for Mac. It was similar to Outlook but didn't work well with Exchange email at first. Over time, it got better at handling Exchange, but it was always a different program than Outlook. Entourage was replaced by Outlook for Mac 2011, which features greater compatibility and parity with Outlook for Windows than Entourage offered. It

3233-415: The relevant servers share a consistent configuration. Mail servers that practice inter-domain message-forwarding may break SPF even if they do not implement SPF themselves, i.e. they neither apply SPF checks nor publish SPF records. Sender Rewriting Scheme provides for a generic forwarding mechanism compatible with SPF. Client forwarding can take place automatically using a non-interactive client such as

3294-420: The right of @ in an email address ) defines the target server(s) for the corresponding class of addresses. A domain may also define backup servers ; they have no mailboxes and forward messages without changing any part of their envelopes. By contrast, primary servers can deliver a message to a user's mailbox and/or forward it by changing some envelope addresses. ~/.forward files (see below ) provide

3355-474: The same machine. The sendmail daemon used to run with root privileges so it could impersonate any user whose mail it had to manage. On the other hand, users can access their own individual mail-files and configuration files, including ~/.forward . Client programs may assist in editing the server configuration-files of a given user, thereby causing some confusion as to what role each program plays. The term "virtual users" refers to email users who never log on

3416-399: The terms remailing or redistribution can sometimes mean re-sending the message and also rewriting the "envelope sender" field. Electronic mailing lists furnish a typical example. Authors submit messages to a reflector that performs remailing to each list address. That way, bounce messages (which report a failure delivering a message to any list- subscriber) will not reach the author of

3477-451: The vCard format as a single file. Outlook has also been criticized for having proprietary "Outlook extensions" to these Internet standards. Outlook (both the web version and recent non-web versions) promotes the usage of a proprietary .msg format to save individual emails, instead of the standard .eml format. Messages use .msg by default when saved to disk or forwarded as attachments. Compatibility with past or future Outlook versions

3538-463: Was one of the earlier email clients to support HTML email and scripts. As a result, emails were commonly infected with viruses . Previously, another security flaw was that a script could automatically be opened as an attachment . Another bug was in Outlook Express's attachment handling that allowed an executable to appear to be a harmless attachment such as a graphics file. Opening or previewing

3599-465: Was re-branded as Outlook Mobile—sharing its name with the Microsoft Outlook desktop personal information manager and Outlook.com email service. In January 2015, Microsoft released Outlook for phones and for tablets (v1.3 build) with Office 365 . This was the first Outlook for these platforms with email, calendar, and contacts. On February 4, 2015, Microsoft acquired Sunrise Calendar ; on September 13, 2016, Sunrise ceased to operate, and an update

3660-683: Was released as Microsoft Internet Mail and News in 1996 following the Internet Explorer 3 release. This add-on precedes the Internet Mail profile for Microsoft Exchange 4.0 bundled in Windows 95 . Version 2.0 was released at the end of 1996. Internet Mail and News handled only plain text and rich text ( RTF ) email, lacking HTML email . In 1997 the program was changed and renamed to Outlook Express and bundled with Internet Explorer 4 . The Windows executable file for Outlook Express, msimn.exe ,

3721-558: Was released to Outlook Mobile that contained enhancements to its calendar functions. Similar to its desktop counterpart, Outlook mobile offers an aggregation of attachments and files stored on cloud storage platforms; a "focused inbox" highlights messages from frequent contacts, and calendar events, files, and locations can be embedded in messages without switching apps. The app supports a number of email platforms and services, including Outlook.com , Microsoft Exchange and Google Workspace (formerly G Suite) among others. Outlook mobile

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