Outlook is an email and calendar software available as a part of the Microsoft Office suite. It allows you to send and receive email messages and track your task. It uses an OST file which is the Outlook data file when you have an Exchange account and want to work offline. At times, users have seen the “The file username ost is in use and cannot be accessed” error when launching Outlook. If you also face this error, then in this tutorial, we have suggested some methods to fix this error.

If you see The file username.ost is in use and cannot be accessed message while logging into Outlook, then here we have given some methods to fix this issue :

1] Restart your system and router

2] Disable Cached Exchange Mode

3] Close Microsoft Outlook and related programs

4] Repair OST file with Inbox Repair Tools

5] Recreate the OST file on your computer.

Timecodes:
0:00 Intro
0:23 Restart system and router
0:35 Disable cached exchange mode
1:05 End Microsoft related processes

Learn more on https://www.thewindowsclub.com/outlook-the-file-username-ost-is-in-use-and-cannot-be-accessed

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