Microsoft Outlook

This article is about the desktop subscription software. For web platform, see Outlook on the web. For the email service, see Outlook.com.

Microsoft Outlook
Developer(s)Microsoft Corporation
Initial releaseJanuary 16, 1997 (1997-01-16)
Stable release(s)
Microsoft 365 & Retail[a] (Windows)2508 (Build 19127.20192) / 3 September 2025 (2025-09-03)[1][2][3][4]
Microsoft 365 (Mac)16.100.3 (Build 25083017) / 2 September 2025 (2025-09-02)[5]
Office 2024 (LTSC)2408 (Build 17932.20496) / 3 September 2025 (2025-09-03)[2]
Office 2021 (LTSC)2108 (Build 14334.20244) / 4 September 2025 (2025-09-04)[3]
Office 2019 (LTSC)1808 (Build 10417.20042) / 4 September 2025 (2025-09-04)[4]
Operating systemWindows, macOS, Android, iOS
TypePersonal information manager
LicenseTrialware
Websiteoutlook.office.com

Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft 365 software suites. Primarily 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 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 on the web, formerly Outlook Web App, a web version of Microsoft Outlook, included in Microsoft 365, Exchange Server, and Exchange Online (domain outlook.office365.com)
  • Outlook for Windows, a free Outlook application that is preinstalled with Windows 10 and later
  • Outlook Mobile, a mobile app version of Outlook
  • Outlook.com, formerly Hotmail, a free personal email service offered by Microsoft alongside a webmail client (domain outlook.live.com)


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  1. ^ "Release notes for Current Channel". Microsoft Learn. Retrieved September 4, 2025.
  2. ^ a b "Update history for Office LTSC 2024 and Office 2024". Microsoft Learn. Retrieved September 4, 2025.
  3. ^ a b "Update history for Office LTSC 2021 and Office 2021". Microsoft Learn. Retrieved September 4, 2025.
  4. ^ a b "Update history for Office 2016 C2R and Office 2019". Microsoft Learn. Retrieved September 4, 2025.
  5. ^ "Update history for Office for Mac". Microsoft Learn. Retrieved September 3, 2025.
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