Solved – The Outlook Data File Has Reached the Maximum Size

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  • Published on
    January 27th, 2021
  • Updated on
    February 21, 2022
  • Read Time
    4 minutes
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Summary:- MS Outlook is an email client that is used to send and receive emails. Also, MS Outlook allows the users to open their PST and OST file formats. Outlook file has some data limits to store the data items. In 2010, 2013, and 2016 the size limit was 50 GB. It usually stores the mailbox data in the PST format. Mailbox data files can be calendar, notes, tasks, emails, etc. Some of the users have received the error the Outlook data file has reached the maximum size. This is caused due to some Outlook file size data limit or large PST file size problem.

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Reason for the Outlook Data File Reached the Maximum Size

  • It can occur due to the file size problem of the PST file in Outlook.
  • Also, when the data file in Outlook has reached the maximum size limit.

These are some of the reasons that cause the error that the Outlook data file reached the maximum size. Now you can perform some of the solutions as mentioned below.

How to Fix Outlook Data File has Reached the Maximum Size

Delete Unwanted Items

  1. First, you have to open the PST file. Now, mark those items that are not important to you in the future.
  2. After that, you can Delete all the marked items.
  3. At last, Erase the deleted Items folder permanently.

This helps to reduce the size of the PST files. It solves the problem for the Outlook data file reached maximum size in Outlook 2016. If you are still facing some problems, then use another solution.

Archive Outlook Data Files

  • First, you have to open MS Outlook and then select the File option.
  • After that, press on the Info option and then click on the Mailbox setting.
  • After that, click on Cleanup and then Archive those files.
  • Now, select the Inbox and then select the date that you want to archive.
  • Click on the Browse button. Then select the Path where you want to save the archive file.
  • At last, a separate Archive folder is created.

After following the above solution, you can solve the query for Outlook data file has reached the maximum size. There are some limitations to these solutions. You can refer to them as mentioned below.

Limitations for the Above Solutions

  • It is a time-consuming process, and there is a chance of data loss.
  • It cannot reduce the PST file of large size.
  • A non-technical person can only work under complete guidance.

SysInfo PST Compress And Compact Tool

Moreover, after performing the above solutions. You cannot reduce the large size PST file. To overcome these limitations, I recommend a PST Compress Tool. It allows reducing the size of the PST file by removing attachment files. Also, it can compress PST files with attachments.

It helps to compress multiple PST in a single run. Also, this allows users to attach their new PST files to Outlook. You can apply passwords to the newly created PST files by using the PST Compress and Compact Tool. It can save the first 5 mails after compression. Also, this tool cannot provide compression to be done at a fast speed. PST Compact tool provides some basic features such as high-speed compaction, search, the low footprint of exe files.


Many of the users are facing the problem that the Outlook data file has reached the maximum size. To fix this problem, I have mentioned some of the reasons and solutions. These solutions help to delete unwanted data that has no use in the future and leads to an increase in Outlook mailbox size. Also, it helps to archive your data. After performing these solutions, I came to know about some limitations. To overcome these limitations, I have mentioned an expert solution ie. PST Compress And Compact Tool.

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