This will also make them easier to surface later. Put any items you want to keep in an archive to free up space. Once you’ve got your mailbox cleaned up, you’ll want to keep it that way! Some ways you can prevent your mailbox from being cluttered include: How to Prevent Your Outlook Mailbox from Getting Full Once you’re in Mailbox Cleanup you will be able to: You can find it by navigating to File > Tools > Mailbox Cleanup. Luckily, Microsoft provides a Mailbox Cleanup tool in Outlook that makes it easy to cut down on the amount of email you’ve accumulated. Once you know that your mailbox is at capacity, it’s probably time to start cleaning it up. Yikes! How to Manage Storage When Your Outlook Mailbox is Full
In the example above it looks like this user has a whopping 1376.6 MB of data. Unfortunately, it’ll only appear in kilobytes, so to estimate the megabytes you’ll need to move the decimal over three spots.
