Microsoft does this because mail takes up space on your hard disk, and if you’ve only got a small hard disk, you probably don’t want much of it taken up with a few large files someone emailed you two years ago.
Between 32 and 64 GB (not inclusive): Outlook retains three months of email.Less than or equal to 32 GB: Outlook retains one month of email on your system.It also uses that check to set a parameter in Outlook that determines how much mail will be downloaded to your local machine, based on the following disk sizes: When you install Microsoft Office, it checks your disk size to make sure you have enough space to install all of the applications.
