Assume that a calendar contains some recurring meetings or appointments in a Microsoft Exchange Server 2010 environment. Additionally, assume that you try to change a single item in a series of recurring calendar items (for example, you change the recurring range of a single item), or you try to publish the calendar's free/busy data. In this scenario, the Microsoft Exchange Mailbox Assistants service (MSExchangeMailboxAssistants.exe) crashes on the Exchange Server 2010 Mailbox server.


This issue occurs because a System.ArgumentOutOfRangeException exception occurs when the Exchange Mailbox Assistants service processes a recurring calendar item that contains corrupted recurrence binary large object (BLOB) data.


To resolve this issue, install the following update rollup:

2746164 Description of Update Rollup 6 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.

More Information

For more information about how to publish free/busy data, go to the following Microsoft website:

How to publish free/busy dataFor more information about recurrence BLOBs, go to the following Microsoft website:

General information about recurrence BLOBs

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