Old emails take up unnecessary space on your server and can slow down outlook. If you want to free up space but also keep the emails for future review you can opt to archive old emails. This can increase your servers speed and free up space for more emails.
The AutoArchive feature will periodically scan your mailbox and automatically move certain items into the archive file.
Click the File tab.
The Outlook Options dialog box appears.
Click the AutoArchive Settings button.
The AutoArchive dialog box appears, letting you control whether AutoArchive runs, and how it works when enabled.
Adjust the settings.
You can specify how often AutoArchive runs, and you can choose whether to receive a notification before it runs. You can choose whether to delete items or move them to the archive, specifying an age they must be older than and choosing a location for the archive file.
Click OK twice.
Now, AutoArchive will periodically scan your mailbox, automatically remove any emails older than the designated date, and add them to the Archived Inbox file.