How to Increase the size of PST File

125 pts.
Microsoft Outlook 2003
Personal Store (.pst)
AOA Sir i am using Microsoft outlook2003 for receiving mail from mail server.The size of my outlook.pst file hasbeen exceeded from 2 GB and now outlook display a message the you have exceed from the require limit of pst file so please delete some mails from your inbox. My question is that how we can exceed the size of our *.pst file without deleting any mail from outlook. Thanks Muhammad Usman.

Answer Wiki

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Create another PST file and move some of your older email into that PST file.

For example I break down all my email by year so that my PST files don’t get to large.

Further Information,
Looks like you have an ANSI pst which is set at 2gb default size. You cannot increase this size.
The solutionis to create a new pst file but in unicode format and then move some of the contents from the old pst file to the new pst file. You dont have to move all contents, ~500mb should be sufficient.
Once you have done that you should compact the old pst file.

UNICODE supports pst files of size 20gb.


I have had success using Ontracks Data Recovery suite to deal with this problem. On another PC with Outlook 2003 and the Data Recovery softwre, you can ‘repair’ the .pst file to larger than 2GB. Then, use Outlook to Export older data to another .PST file.

Also, this little tidbit may be helpful:

To force Unicode or ANSI psts, navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook
Add the NewPSTFormat value with one of the following values:

Prefer Unicode PST: 0 (default)
Prefer ANSI PST: 1
Enforce Unicode PST: 2
Enforce ANSI PST: 3

By using a value of 2 or 3, you can restrict all new .pst files to either the old format or the new format. Note however, that Outlook will not open the mailbox folders if you are using IMAP or Hotmail/MSN accounts and try to force Unicode format pst’s – they require the ANSI format used by Outlook97/2002.

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  • Hkboy
    Hi Usman outlook 2003 can support pst files larger than 2GB. you might have to set a registery setting. below is the link to follow and should help you resolve your issue as well.
    40 pointsBadges:
  • Jirvine
    If the file has already gone over the 2gb limit and your using the older ANSI format then there is only one solution I can think of that you can do with that PST, cut it down using Microsofts PST crop tool. It's a long tedious process, I've done it many times, and you will lose some emails but you can recover most of the emails.
    520 pointsBadges:

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