How to Clear the Outlook Cache

Delete Microsoft Outlook's cached data

Microsoft Outlook stores files you've used so that it can easily access them again. These files are known as cached files and can be safely deleted. Clear the Outlook cache if old data remains after you delete it, something that may happen when you remove and reinstall Outlook add-ins. Another reason to delete cached files is iOutlook's autocomplete data or other information displays after you delete contacts or reinstall the software.

Instructions in this article apply to Outlook 2019, 2016, 2013, 2010 and Outlook for Microsoft 365.

Illustration of a person deleting Outlook cache
Emilie Dunphy / Lifewire

Delete the Outlook Cache

Removing the cache in Outlook doesn't delete emails, contacts, or other useful information. Outlook automatically makes new cache files when you open it.

  1. Save any work and close Outlook.

  2. Press Windows key+R.

  3. In the Run dialog box, enter %localappdata%\Microsoft\Outlook and press Enter.

  4. Double-click the RoamCache folder to view the cache files.

    Screenshot of Outlook cache files

    Back up the cache files to another folder or external hard drive so that you can restore the files if something goes wrong.

  5. To delete the cache files, press and hold the Shift key while selecting all of the files. Then press the Delete key, or right-click the highlighted files and select Delete.

    Screenshot of deleting cache files in Outlook
  6. If you're prompted to confirm the deletion, press Yes.

Clear Auto-Complete Cache

If you only want to clear the auto-complete cache, either turn off auto-complete so the cached data doesn't display or delete the auto-complete cache completely.

  1. Go to the File tab and choose Options.

    Screenshot of selecting Options in Outlook
  2. In the Outlook Options dialog box, select the Mail tab.

  3. To turn off autocomplete, go to the Send messages section. Uncheck the box next to Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines.

    Screenshot of deselecting autocomplete in Outlook options
  4. If you want to clear the auto-complete cache without disabling the feature, select Empty Auto-Complete List. In the confirmation dialog box, select Yes.

    Screenshot of clearing the Auto-Complete cache in Outlook
  5. In the Outlook Options dialog box, select OK.