Error message after an Exchange Server 2007 Service Pack 1 user replies to a message that has more than 300 recipients in Outlook Web Access (OWA): "Microsoft Exchange issued an unexpected response (500)"

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Article ID: 969054 - View products that this article applies to.
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SYMPTOMS

When an Exchange Server 2007 Service Pack 1 (SP1) user clicks the Reply to All button to reply to a message that has more than 300 recipients in Outlook Web Access (OWA), the following HTTP 500 error is returned about two minutes later.
Microsoft Exchange issued an unexpected response (500).

If you click the Show details button, the following information appears:
Request
Url: <OWA link>
User host address: <Client IP>
User: <user name>
EX Address: <EX address>
SMTP Address: <SMTP address>
OWA version: 8.1.xxx.x
Mailbox server: <Server name>

Exception
Exception type: System.Web.HttpException
Exception message: Request timed out.

Call stack

No callstack available

CAUSE

Exchange Server 2007 SP1 performs redundant Active Directory queries for recipients in order to prevent the duplication of messages. However, the check takes a long time when there are many recipients.

RESOLUTION

To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. For more information about Update Rollup 9 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 9 for Exchange Server 2007 Service Pack 1
For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007

STATUS

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

Properties

Article ID: 969054 - Last Review: July 17, 2009 - Revision: 1.1
APPLIES TO
  • Microsoft Exchange Server 2007 Service Pack 1
  • Microsoft Exchange Server 2007 Standard Edition
  • Microsoft Exchange Server 2007 Enterprise Edition
Keywords: 
kbhotfixrollup kbqfe kbexpertiseinter kbfix kbsurveynew KB969054

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