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Consider the following scenario:
You configure the PstDisableGrow registry value to prevent the addition of items to a personal folders (.pst) file in Microsoft Office Outlook 2007.
These items are Microsoft SharePoint Portal Server 2007 items, SharePoint Portal Server 2003 items, or Windows SharePoint Services (versions 2.0 and 3.0) items.
In this scenario, items can still be added to the SharePoint .pst file that Outlook creates in which to store SharePoint data. For example, when you use Outlook 2007 in Cached Exchange Mode to post an item to a SharePoint Internet Calendar folder or to a SharePoint Lists folder, the item is added to the SharePoint .pst file.
How to obtain the hotfix
This issue is fixed in the Outlook 2007 Hotfix Package that was released on February 7, 2008. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
948716 Description of the Outlook 2007 hotfix package: February 7, 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.