As the Folder Size window popups, you get to view the mailbox size limit in Outlook. Step 2: When you are in the Mailbox Cleanup window, go on to View Mailbox Size. Step 1: Start with the Mailbox Cleanup window. Solution to fix Mailbox Size Limit in Outlook 2007/2010/2013/2016 MS Outlook set limit might get exceeded due to any of the reasons.
Read now about Why PST files of Outlook get stuck with an exceed in Outlook size limits? Outlook Mailbox size limit exceeded why? Hence, the Outlook data file has reached the maximum size 2016. That has corrupted your Outlook with error. Now, since your files have exceeded this set limit.