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Exchange Server high cpu usage

April 4, 2013

Ever notice that your w3wp.exe is using up all your cpu and pegging at above 90%-99%?
Good chances that iOS devices are hammering it like crazy.
After dealing with this a number of times (thanks Apple) here is a little trick to quarantine device until they are remediated.

in the Exchange Management Shell type the following:

New-ActiveSyncDeviceAccessRule -QueryString “lOS 6.1 10B141” -Characteristic DeviceOS -AccessLevel Quarantine
New-ActiveSyncDeviceAccessRule -QueryString “los 6.1 10142” -Characteristic DeviceOS -AccessLevel Quarantine
New-ActiveSyncDeviceAccessRule -QueryString “lOS 6.1 108143” -Characteristic DeviceOS -AccessLevel Quarantine
New-ActiveSyncDeviceAccessRule -QueryString “los 6.1 10B144” -Characteristic DeviceOS -AccessLevel Quarantine
New-ActiveSyncDeviceAccessRule -QueryString “lOS 6.1.1 108145” -Characteristic DeviceOS -AccessLevel Quarantine

This will effectively put those versions into Quarantine and take them out automatically once they upgrade to a newer firmware version.

Also setting up a recycling schedule or certain limits in IIS before it recycles would also be a good thing to do after this.


Another cause could be the following:

W3wp.exe process consumes excessive CPU and memory resources on an Exchange Client Access server after you apply Update Rollup 5 version 2 for Exchange Server 2010 SP2 which is re-mediated with Exchange SP3



  1. October 4, 2013 at 4:01:42 AM

    Well some of the application of MS are really creating some much issue. some of them neither use nor user auto closed. you need to manually closed all the application from process explorer.

  2. April 2, 2014 at 12:23:33 PM

    We have also faced the similar issue and I have documented it fully in below link along with the steps that we have taken to re-mediate it..


    This is workaround only as we have lot of IOS devices so waiting for upgrade to IOS 7 as we think that will resolve the issue, As of now those who have upgraded to IOS7 doesn’t come in our High hitters list.

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