Article ID: 943354 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows XP and Windows Vista
On the computer that is running Microsoft Office Outlook 2007, you set the following registry subkey values to limit the file size of personal folders that have a .pst extension:
832925After you make these changes, individual offline folder files that have an .ost extension are also limited in file size, and the limit is equal to the MaxLargeFileSize registry entry in megabytes. Therefore, the offline folder files are no longer unlimited in file size.
(http://support.microsoft.com/kb/832925/ )How to configure the size limit for both (.pst) and (.ost) files in Outlook 2007 and in Outlook 2003
How to obtain the hotfixThis issue is fixed in the Outlook 2007 post-Service Pack 1 Hotfix Package that is dated January 28, 2008. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/941275/ )Description of Outlook 2007 post-Service Pack 1 hotfix package: January 28, 2008
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
How to control the size of the .pst and .ost filesAfter you install the hotfix, you can independently control the size of the .pst files and of the .ost files. Set the MaxLargeFileSize DWORD to limit the .ost file size limit. Set the WarnLargeFileSize DWORD to limit the .pst file size limit. Use values within the following ranges:
Range: 0x00000001 – 0x00005000
Default: 0x00005000 20,480 (20 GB)
Range: 0x00000000 – 0x00005000
Default: 0x00004C00 19,456 (19 GB)
To limit the file sizes, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.