Article ID: 2883156 - View products that this article applies to.
After you apply Microsoft Office 2010 Service Pack 2 (SP2) or hotfixes released after SP2, users may see many Event ID 27 warnings from Outlook in the Application log. This issue occurs for users who have a PST attached to their profile. This includes PSTs that were created by connecting to a Microsoft SharePoint site.
The following is an example event in the Application log:
Log Name: Application
Date: 10/1/2013 1:55:04 PM
Task Category: None
Calendar Folder Property is missing
To resolve this issue, install the Outlook 2010 hotfix package that is dated December 10, 2013. For more information about this hotfix package, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/2849973/ )Description of the Outlook 2010 hotfix package (Outlook-x-none.msp): December 10, 2013
If you are unable to install the Outlook 2010 December 10, 2013 hotfix package, you can use the following workaround. To work around this problem, PSTs can be removed from the profile. To remove PSTs from your Outlook profile, follow these steps: