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As the meeting organizer, you cannot accept a meeting request in Outlook 2007 if you used a public Calendar for the meeting that you created
Article ID: 940403 - 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
As the meeting organizer, you create a new meeting request under a public Calendar folder, and you send the request to a distribution list. Additionally, your e-mail account is a member of this distribution list.
When you receive the meeting request, you cannot click Accept, Tentative, or Decline because those buttons are unavailable. If you click Scheduling Assistant in the meeting request to verify your availability, your "free/busy" information is not updated.
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:
941275Warning 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.
(http://support.microsoft.com/kb/941275/ )Description of Outlook 2007 post-Service Pack 1 hotfix package: January 28, 2008
To enable this hotfix, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.