Exchange 2007 w3wp.exe pegging CPU and Memory Usage

All of a sudden, this morning, the w3wp.exe process is using 80-85% of the CPU and 99% of the memory.  What could be causing this?
e90mdreiAsked:
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AmitIT ArchitectCommented:
Reboot is the first step you can try. Normally, this happens due to handheld users. Especially, IOS users.
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Seth_zinCommented:
Try restarting IIS
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Seth SimmonsSr. Systems AdministratorCommented:
i also vote for restarting IIS first
what role(s) are on this server?
i would also look at IIS logs for any possible abnormal activity
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Will SzymkowskiSenior Solution ArchitectCommented:
On this Exchange server what roles do you have installed? Also a good first step would be checking the logs before you reboot. This way you can try to see what actually impacted the server and the wpw3.exe process. Then reboot the server accordingly.

Will.
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e90mdreiAuthor Commented:
all the roles except for edge transport and unified messaging.
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Will SzymkowskiSenior Solution ArchitectCommented:
What have you found in the logs, during around the time you noticed this spike in performance?

How much mail was flowing to the server during this period?

Have you been able to reboot the server or restart the service?

Will.
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e90mdreiAuthor Commented:
I restarted the iisadmin and w3svc and the spikes have gone down.  however, another issue (or the same issue) has popped up.  outbound email is not being sent.  I don't see it being queued up in the queue viewer.  internal email and external emails are being received...  thoughts?
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Seth_zinCommented:
I don't believe they are related, the IIS was more to deal with OWA and mobile. Is it sitting in outbox? Or does it show as being sent? Are any of the protocols down? SMTP up ok? (Check under services too for anything crashed). Anything in Windows logs?
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Simon Butler (Sembee)ConsultantCommented:
Disk space would stop email from flowing.
The most common cause of IIS high resource utilisation is a mobile device, which can also cause IIS and Exchange transaction logs to bloat up, using disk space.

Simon.
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Seth_zinCommented:
I thought about that too but they said all incoming emails are ok, it's just out going. Plus he should see the emails sitting somewhere, if not at the client.
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Simon Butler (Sembee)ConsultantCommented:
Back Pressure is phased in my experience, so some emails stop first.

Simon.
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e90mdreiAuthor Commented:
The reboot resolved it, for now...will keep an eye on the perfmon.  Thanks!
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