MSExchange Transport Error Event ID: 5006

I am getting an Application error
Source:  MSExchange Trasport
Event ID:  5006
Level:  Warning
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That indicates the Exchange Server is looking for an 'old' nonexistent exchange server (server is still in use but not as exchange server).
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Cannot find router to Mailbox Server CN=WrongServerName, CN-Servers,CN-first administrative group,CN=Administrative Groups,CN=CorrectDomainName,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=CorrectDomain,DC=local for store CN=Public Folder Store (WrongServerName),CN=First Storage Group,CN=InformationStore,CN=WrongServerName,CN=Servers,CN=first administrative group,CN=Administrative Groups,CN=CorrectDomainName,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=CorrectDomainName,DC=local in routing tables with timestamp 9/5/2013 5:14:02 PM. Recipients will not be routed to this store.
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Then had MSExchange ActiveSync Event ID:  1033 stating:
The setting ExternalProxy in the Web.Config file was not valid. The previous value was null and has been changed to .
and:  A process serving application pool 'MSExchangeOWAAppPool' exceeded time limits during shut down. The process id was '8296'.

Everyone's email stopped working and Found the Exchange System Attendant services had stopped.
Started the service and restarted Outlook
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What would cause this?
ITIExperts1Asked:
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SteveCommented:
with regard to the wrong server issue, it looks like a previous migration fro an old email server may not have been completed.

This is a good guide to removing old servers
http://www.petri.co.il/forums/showthread.php?t=37992

make sure you have backups before attempting as ADSI edit is a dangerous tool in the wrong hands :-)

as for the other stuff, you don't mention any details on what version of exchange or server you are using so it's a bit vague.

The best place to start is finding out which process caused it to stop.

The process id was '8296'.

if it occurs again check the process id to see what was responsible for the shutdown request.
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