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Emails serve as a great reference for past work, so people are often reluctant to delete them. However, if you exceed your inbox memory limit, you will be unable to send/receive new emails and keeping every email can make searching through emails painstakingly slow. Don’t fret! You can easily clean up storage space without having to resort to deleting any messages. Archived messages don't count toward your 99 GB limit.
Archiving your emails provides an easy, reliable way to free up storage space while still providing you access to all the emails you’ve ever sent and received. Outlook also allows you to be in control of the method and frequency of archiving and has provided the following resources: