Incorrect exceptions are generated for a recurring iCalendar message when an Exchange Server 2007 server processes an SMTP message that contains the iCalendar message part

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Article ID: 973969 - View products that this article applies to.
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An EXDATE property defines the dates and the times of the exceptions for a recurring calendar component. When a Microsoft Exchange Server 2007 server processes a Simple Mail Transfer Protocol (SMTP) message that contains a recurring iCalendar message part, the server only acknowledges the last EXDATE statement of a multi-line EXDATE property. In other words, the server ignores all previous EXDATE statements. The server also ignores the dates of the EXDATE property when a single-line EXDATE statement contains multiple dates. Therefore, the dates and the times of the exceptions for the recurring iCalendar message are incorrect.

Multiline EXDATE
EXDATE;TZID=Central Europe Standard Time:20100512T084700
EXDATE;TZID=Central Europe Standard Time:20100612T084700
EXDATE;TZID=Central Europe Standard Time:20100712T084700
In this sample, the VEVENT component in iCalendar contains a multi-line EXDATE statement. Therefore, only the last line of the EXDATE statement is kept.
Single-line EXDATE
EXDATE;TZID=Central Europe Standard Time:20100512T084700,20100612T084700,20100712T084700

In this sample, the comma syntax that separates the date values in the EXDATE statement is interpreted incorrectly. Therefore, the EXDATE statement is discarded.


To fix this problem, install the following update rollup:
972076 Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about the EXDATE property and the VEVENT component in iCalendar, visit the following IETF Web site:


Article ID: 973969 - Last Review: January 22, 2010 - Revision: 1.1
  • Microsoft Exchange Server 2007 Service Pack 2, when used with:
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
kbhotfixrollup kbfix kbqfe kbsurveynew kbexpertiseinter KB973969

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