Software & Apps MS Office How to Clear the Outlook Cache Delete Microsoft Outlook's cached data by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on May 15, 2020 reviewed by Jon Fisher Lifewire Tech Review Board Member Jonathan Fisher is a CompTIA certified technologist with more than 6 years' experience writing for publications like TechNorms and Help Desk Geek. our review board Article reviewed on Apr 04, 2020 Jon Fisher MS Office Outlook Word Excel Powerpoint Tweet Share Email 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. 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. Save any work and close Outlook. Press Windows key+R. In the Run dialog box, enter %localappdata%\Microsoft\Outlook and press Enter. Double-click the RoamCache folder to view the 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. 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. 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. Go to the File tab and choose Options. In the Outlook Options dialog box, select the Mail tab. 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. 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. In the Outlook Options dialog box, select OK.