Outlook doesn’t automatically store all your email on your computer. If you’re trying to view an old email and find that you can’t see messages older than a certain point, you may need to tell Outlook to download them.
Over time, Outlook may remove old email messages from your computer to save space, but those emails will usually stay on the server. As you scroll down through your inbox, you’ll eventually reach the end of what’s stored locally.
If you frequently need to see older emails, or if Outlook is taking up too much room on your computer, you can change the amount of mail stored on your computer.