Solved – Error Outlook Mailbox Size Limit Exceeded!

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  • Published on
    May 25th, 2020
  • Updated on
    June 21, 2021
  • Read Time
    2 minutes
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The quota for email is usually set within your organization by the Microsoft Exchange administrator. In certain instances you may be given more space by administrators if you reach them. The Personal Folders feature in Outlook is available that can also be used to store Outlook items locally on your hard drive. Items are not counted towards your quota in the Personal Folder.

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Most of the time administrators set mailbox size limits when they run Outlook over Exchange Server. After setting the size limit, when users try to send the email or receive the email sometimes the mailbox size limit exceeds, and users get an error message ‘Outlook Mailbox size limit exceeded’. If the Outlook mailbox goes beyond its size limit, you will no longer be able to observe or read its contents. You can experience error messages when introducing additional items to the PST file regarding the data file having exceeded the Mailbox capacity.

There could be some other scenarios as well for this situation, like older versions of Outlook OST and PST files, or Outlook PST default size got exceeded.

Why Outlook Mailbox Size Limit Exceeds?

There’s several conditions that could increase the size of Outlook mailbox beyond its allowable limit. Some of them are as follows:

  • When you are running Outlook on Exchange Server and set the mailbox size limit.
  • If you are working with an older MS Outlook version.
  • When your Outlook PST file exceeds its default size for storing emails.

To conquer the issue, go through the below info-graphic. It’s a complete DIY solution to reduce size limit of Outlook Mailbox.

Outlook Mailbox Size Limit Exceeded
Outlook Mailbox Size Limit Exceeded


Most of the time, the issue is due to large or overgrown PST files. There are always some duplicate emails and large  attachments that make the PST file overgrown. In such a situation you can use PST Compress Software or the stated method to increase the mailbox size. I hope this will resolve the ‘Outlook Mailbox size limit exceeded’ error in Outlook without any issue.

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