Your Outlook mailbox can only retrieve so much, and it is a good bet that you will not stop receiving emails anytime soon. To keep it from filling up your entire inbox, you can move old items you want to keep to an archive, a separate Outlook Data File (.pst) that you can open from Outlook any time you need it.
Step 1 - Click on File
Step 2 - Select Cleaning Tools and click Archive
Step 2 - Click Archive this folder.
- Select the "older then" date for which you want to archive.
- Click OK then you are done !
TIP: Archiving might not be available if your mail profile connects to an Exchange Server. It is also possible that your organization has a mail retention policy that overrides AutoArchive. Check with your system administrator for more information.