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You are using an older version of Outlook data file (.ost or.You’re running Outlook on Exchange server and have set mailbox size limit.Possible Reasons Behind Exceeded Outlook Mailbox Size Limitįollowing are some situations that may increase Outlook mailbox size beyond its permissible limit: If your PST file gets corrupt, use Stellar Repair for Outlook to repair the PST file with precision and speed. Also, as PST file exceeds the maximum size limit, the propensity for data corruption increases exponentially. Note: Even if you don’t receive a warning, your Outlook PST file might become so large that it slows down Outlook’s performance. The message is displayed as a warning notification to inform users that they have exceeded the storage limit for their mailbox, i.e., the Outlook mailbox is full. It’s common for Outlook users to encounter the error message ‘You have exceeded the size limit on your mailbox’.
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