A meeting request is stamped as Busy instead of Tentative when it is sent from an external user to an Exchange Server 2007 user

Article ID: 955480 - View products that this article applies to.
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SYMPTOMS

An external user sends a meeting request to a Microsoft Exchange Server 2007 user who is using Microsoft Office Outlook 2003. In this situation, the meeting request is stamped as Busy in the calendar of the Exchange Server 2007 user. However, the meeting request should be stamped as Tentative until the Exchange Server 2007 user accepts or declines it.

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CAUSE

This problem occurs because Exchange Server 2007 converts the meeting request from the iCalendar format to the MAPI format and sets the corresponding field to Busy. Exchange Server 2007 does this because of the following line in iCalendar format. 
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
However, Outlook 2003 directly uses this field value in the Show time as field in calendar. Instead, Outlook 2007 converts a Busy status to a Tentativestatus. Therefore, this issue does not occurs for Outlook 2007.
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RESOLUTION


For Exchange Server 2007 Service Pack 1 (SP1)

To resolve this issuein an Exchange Server 2007 SP1 environment, install the following update rollup:
Description of Update Rollup 8 for Exchange Server 2007 Service Pack 1
(http://go.microsoft.com/fwlink/?LinkId=157084)

For Exchange Server 2007 Service Pack 3 (SP3)

To resolve this issue in an Exchange Server 2007 SP3 environment, install the following update rollup:
2530488
(http://support.microsoft.com/kb/2530488/ )
Description of Update Rollup 3 for Exchange Server 2007 Service Pack 3
Important If your computer is running Exchange Server 2007 Service Pack 2, we recommend that you upgrade it to Exchange Server 2007 SP3, and then install Update Rollup 3 for Exchange Server 2007 Service Pack 3.
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WORKAROUND

To work around this problem, use Outlook 2007 as the client software.

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MORE INFORMATION

For more information about iCalendar and X-MICROSOFT-CDO-BUSYSTATUS, visit the following Microsoft Web site:
General information about iCalendar and X-MICROSOFT-CDO-BUSYSTATUS
(http://msdn.microsoft.com/en-us/library/aa494215(EXCHG.80).aspx)
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
833340
(http://support.microsoft.com/kb/833340/ )
How to modify the appearance and the functionality of Outlook Web Access by using the segmentation feature in Exchange 2003
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Properties

Article ID: 955480 - Last Review: March 31, 2011 - Revision: 5.0
APPLIES TO
  • Microsoft Exchange Server 2007 Service Pack 3
  • Microsoft Exchange Server 2007 Service Pack 2
  • Microsoft Exchange Server 2007 Service Pack 1, when used with:
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
Keywords: 
kbexpertiseinter kbfix kbhotfixrollup kbsurveynew kbqfe KB955480
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