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What is maximum PST size limit for different versions of MS Outlook?

 Modified on: May 14, 2020 |    53169 views

Microsoft Outlook stores all the data in a single file known as Personal Storage File (PST). In other words, it is a data file used for the storage of Outlook e-mail objects, such as contacts, attachments, appointments, contacts, journal, tasks, events, etc. Each version of Outlook has a different format. These formats are of two types- ANSI and UNICODE. Versions prior than Outlook 2002 uses American National Standards Institute (ANSI) format whereas later versions of Outlook employs UNICODE format.

Along with different format, different size limit has also been set by Microsoft. Once the set size limit gets exceed, an addition of no more data is allowed in a PST file.

Size limits for different versions of Outlook:

  • Outlook 2002 and prior versions of Outlook allow you to store data only up to 2 GB of data.
  • Outlook 2003 and 2007 have the size limit of 20 GB.
  • Outlook 2010, Outlook 2013 & Outlook 2016 has file size limit up to 50 GB that can be increased or decreased by applying changes to the Windows registry settings.

Once the Outlook PST file approaches the set size limit, it fails to add more data in it. Moreover, Outlook starts behaving abruptly and can even get corrupt. So, it is always advisable not to store unwanted data of Outlook e-mail objects in a PST file.

Note: If your PST file is already corrupt, you can repair it using >Outlook PST Repair.



5 User Comments

Are you saying that your .olm to pst converter will convert any file <50 GB?
Outlook Mac 2011 to Outlook Windows 2013 is what I plan to do.
I intend to purchase your tool and am unsure if the tool will convert all 25 GB of my data mail and contacts/calenders


Hi Rohit,

Yes, there is no file size limitation to use OLM to PST converter tool. This tool can convert almost any amount of data including mails, calendars, contacts etc. from OLM to PST file type.

You can surely convert all your mail data from Outlook Mac 2011 to Outlook Windows 2013.

Glad to address in case you've any further queries.

Amit Pandey

how much size PST import in office 365 (MAC BOOk Air)


Hi? What is the maximum size of the PST file that your software (v support for Windows 10 Home ?
How long it takes to analyse the PST file (47Go size), I run your software for 6 hours it was still analysing ?
Thank you.
P Andrei




There is no size limitation in our software for PST.

Scanning time depends on a lot of factors like capacity of the drive, severity of corruption etc. Therefore we can’t give you an estimate about the scanning time.

As long as the software is not getting stuck during scan, we suggest you to kindly continue with the scan and check results.

For more help, please submit ticket using below link.


Stellar Data Recovery


User Comments



Stellar Repair for OutlookStellar Repair for Outlook scans the corrupt PST file and repairs and restores all mailbox contents. The repaired email items are saved as new usable PST file which can imported in MS Outlook.

Learn More


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