1] Repair Outlook Data Files. The Outlook Data File (.ost and .pst) contains your Outlook messages, emails, and other items. If your Outlook Data File becomes corrupted, it may lead to various issues.

Next, click on the Mail (Microsoft Outlook) option and press the Email Accounts button in the dialog that appears.. After that, navigate to the Data Files tab, select your account, and click on ...

Open Outlook. Click the "Folder" tab. Select "Recover Deleted Items" from the "Clean Up" group. Click the item you want to recover from the Recover Deleted Items dialog box, and then click the ...

It's also important to scan your Outlook Data files and repair any errors that may occur as a ... Click "End Process" when prompted by a Task Manager dialog box to end the process. Advertisement.

Microsoft has fixed a known issue affecting Outlook for Microsoft 365 users since June and causing slow starts and freezes as if Offline Outlook Data Files (OST) were syncing right after launch.