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Article ID: 2549255 - Last Review: February 13, 2012 - Revision: 1.0


Consider the following scenario:
  • You synchronize a Microsoft Exchange Server 2010 mailbox with a mobile device by using Exchange ActiveSync.
  • The mailbox has a meeting item that lasts more than 24 hours but is not an all-day event. For example, a meeting request starts at 13:00 on Monday and ends at 16:00 on Tuesday.
In this scenario, the meeting item displays as multiple all-day events in the calendar.


This issue occurs because the AllDayEvent property should not be set when Exchange ActiveSync synchronizes the mailbox with the mobile device.


To resolve this issue, install the following update rollup:
2645995   ( / ) Description of Update Rollup 1 for Exchange Server 2010 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 Exchange ActiveSync, visit the following Microsoft website:
General information about Exchange ActiveSync (
For more information about the AllDayEvent property, visit the following Microsoft website:
General information about the AllDayEvent property (

  • Microsoft Exchange Server 2010 Service Pack 1, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
kbqfe kbfix kbsurveynew kbexpertiseinter KB2549255
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