MSExchangeSyncAppPool (w3wp.exe) consuming all CPU time!

Hi

I have 2008 R2 server where I run Microsoft Exchange 2007. I noticed that the server was running very slow so I checked the task manager and I realised that one intance of w3wp.exe was taking all the resources. I tracked the instance to be related to the MSExchangeSyncAppPool. As soon as I stop that app pool the server goes back to "normal".

I've tried adjusting "Recycling" and other options in the same category but nothing helps.

Anyone?!
CaperuzzoAsked:
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Alan HardistyCo-OwnerCommented:
Do you have any iPhones with iOS 4.0 on them?  Is so, this is a known problem and they need to have the iOS upgraded to the latest version.

My blog describes the issue:

http://alanhardisty.wordpress.com/2010/07/02/apple-ios4-issues-with-iphone-4-3gs-3g-and-exchange/
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CaperuzzoAuthor Commented:
Thank you. I will give this a try and get back to you!
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CaperuzzoAuthor Commented:
Thank you alanhardisty! Worked perfectly!
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eli_migdalCommented:
how can i see which accoutn is causing the problem ?
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eli_migdalCommented:
I have the same excact problem ,
i have lots of Apple users , aprox 50 ...

how can i narrow it down and find the problematic one ?
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gfsupportCommented:
This person has suggested Exmon to find out which user is causing the problem. I'm about to try that myself.

http://blogs.technet.com/b/mikelag/archive/2008/07/15/iphone-2-0-and-high-cpu-usage-on-exchange-servers.aspx

-Mike Sackur
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eli_migdalCommented:
The new exchange rollup fixed it
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eli_migdalCommented:
And the problem is back :(
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