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.

Describes how to investigate items in an Outlook Data File (.pst) and troubleshoot search issues.

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.

Outlook Data File (.pst) support in new Outlook provides access to emails stored in a .pst file. You can browse, manage, and move emails (drag and drop) between .pst files and mailboxes.

Moving a .pst file from one computer to another doesn't transfer your email account settings. If you need to set up Outlook on a new computer, copy your .pst file from the old computer, then …

Certain types of accounts, such as POP accounts, store their information in Outlook Data Files (.pst files). Outlook 365 accounts, Exchange accounts, IMAP accounts, and Outlook.com …

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 …

Tous les fichiers de données Outlook (.pst) et les fichiers de données hors connexion (.ost) sont répertoriés avec le nom du compte auquel les fichiers sont associés.

You might have stored Outlook items in an Outlook Data File (.pst) that you created in classic Outlook. If you want to open or close a .pst file, you now can do that in a few simple steps from …

If you have a large .pst or .ost file, you may experience application pauses while you perform typical operations in Outlook. These typical operations include reading, moving, and deleting …