How to Increase Storage Capacity of PST in Outlook 2003/2007

Posted: December 20, 2008 in Tips
Tags: , ,

Increase storage Capacity of PST in Outlook 2003/2007


Enter into Regedit:



After open regedit, You have to create subkey named PST under the below mentioned path.






Enter storage capacity value:

Here you must create and set 2 new DWORD values (note that these values are case senstive);

  • WarnLargeFileSize

  • MaxLargeFileSize



















Put value in DWORD.




Don’t set this higher than 4090445042 (decimal)



 Don’t set this higher than 4294967295 (decimal)





The first value is how many MB a user can write to a pst-file. The second value is how many MB the system can write to a pst-file. This difference has to be at least 5% since there is more written to a pst-file than just user data.

For Outlook 2007 follow the same procedure as mentioned above under the following path.


Outlook 2007: HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0Outlook

  1. rezanayem says:

    Its a great post. I shall try at my pc.

  2. I really blog as well and I am authoring a thing similar to this excellent posting, “How to Increase Storage Capacity of PST in Outlook 2003/2007 Meezbahs
    Blog”. Do you really care in the event I actuallyemploy
    a lot of of your personal ideas? Regards ,Shari

  3. meezbah says:

    Thank you for your opinion.

  4. Chifor Calin says:

    Thank you for the instructions. They were better than Microsoft’s and they worked.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s