How to Clear the Outlook Cache Print

Cache, Errors & Issues, Outlook, Windows, Mac
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Overview

Clearing the Outlook cache can fix problems like missing emails or sync delays.

Step 1 - Close Outlook

Make sure Outlook is completely closed before proceeding.

Step 2 - Delete Cache Files (Windows)

Press Windows Key + R and type the following into the Run box:

%localappdata%\Microsoft\Outlook

Delete the .ost files in this folder (these will be recreated automatically when Outlook restarts)

Step 3 - Delete Cache Files (Mac)

In Outlook for Mac, go to Tools > Accounts
Select your account and click the minus (–) button to remove it
Re-add the account to clear the cache

Notes

Outlook will automatically rebuild the cache and resync with your mailbox after restarting
Deleting the .ost file does not delete your emails — they will resync from the server

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