Your Outlook email cache can be responsible for a number of issues on your device as well as in the application. If you are encountering issues like sluggish performance, syncing issues and even out-of-date autocomplete recommendations, then all of this can happen because of too much email cache in Outlook. There is a very simple way through which you can complete Outlook clear cache action, and this article is going to tell you about the same. 

Method 1: Remove autocomplete cache (proposed emails)

If you see that Outlook is stating an email address as incorrect or obsolete, then you can use the File option in the menu to clear out the auto-complete list. This option is present in the Send Messages folder. 

Method 2: Clear Cache Files (Stored Data)

Now, if you are interested in removing all the local cache files, then you can do this from the Outlook stores. Look for ‘C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook’ and delete all the files that appear as ‘.OST’ and ‘.NST’. Once this is done, you can reopen your Outlook mailbox to see whether it is working fine or not. 

Remember that removing your actual emails requires clearing the cache. But before changing anything, it would be wise to save important data. Doing this often will keep Outlook operating smoothly and prevent unanticipated difficulties.