How to compact your email to regain storage

Before you do this, make sure you delete any emails you don’t need and empty out deleted items, otherwise, you will not regain storage space. Outlook creates an Offline Outlook Data File (.ost), which caches data of your emails, default location is system drive:\Users\YourUserName\AppData\Local\Microsoft\Outlook Also, if you have created an Archive of your email, then …