Outlook Data Files (.pst), or Personal Storage Tables files, contain Outlook user messages and other Outlook items, such as contacts, appointments, tasks, notes, and journal entries. You …

If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.

Outlook Data Files (.ost) are used when you have an Exchange account and want to work offline or use or use the default Cached Exchange Mode. This type of data file is also used for …

Learn how to find out the size of your mailbox and its folders and how to compact Outlook Data Files (.pst and .ost), which might help improve performance.

Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.

Oct 28, 2025 · This non-security update for Windows 11, version 25H2 and 24H2 (KB5067036), improves functionality, performance, and reliability. To learn more about differences between …

Hotmail is now Outlook.com To sign in to Hotmail, you'll need your Microsoft account username and password. Sign in at outlook.live.com

More help If you're using a work or school account and couldn't install classic Outlook following the steps above, contact the IT admin in your organization for assistance.

Feb 4, 2025 · Learn how to install Windows 11, including the recommended option of using the Windows Update page in Settings.

Jul 8, 2025 · This security update includes fixes and quality improvements that were a part of the following updates: June 10, 2025—KB5060533 (OS Builds 19044.5965 and 19045.5965) June …