Users Are Unexpectedly Logged Off From Outlook Web Access

A week or so ago, my users of Outlook Web Access (OWA) began to be unexpectedly logged off.  Being typical users, they did not report it for about a week, and I know of know changes to the system, configuration.  When they are logged off, a message is posted in the system event log that:  A worker process with process id of '....' serving application pool 'MSExchangeOWAAppPool has requested a recycle because it reached its virtual memory limit.  I tried disabling the virtual memory limit, and it returned on IIS restart.  I raised the limit and restarted IIS, and the problem continues.

My environment is Windows Server 2003 R2, 64-bit, with Exchange 2007, 64-bit, installed.  The machine has 18GB of memory installed, with a 16GB page file size.  The machine runs IIS 6.0.  The memory usage peak is around 16GB.  I am using OWA in IE 8.0 and set to a private computer.  (I have tried it in Firefox and as a public computer, with similar issues).  I could find nothing of this in Microsoft's knowledge base.

Does anyone have any suggestions?

Thank you,
Harold KrongelbPresident/Engineering SupervisorAsked:
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Sergey KolesnikConnect With a Mentor IT ManagerCommented:
You may have to try following solution:
1. Click Start, click Run, and then type cmd at the command prompt.
2. Change to the directory where Adsutil is located. The following is the default directory location: %SYSTEMROOT%\Inetpub\AdminScripts
3. Type the following command: cscript adsutil.vbs Set w3svc/AppPools/MSExchangeOWAAppPool/AppPoolRecycleMemory false
You might want to have a look here for instructions on tracing memory leaks:

IIS Debug
Harold KrongelbPresident/Engineering SupervisorAuthor Commented:
This seems to have done the trick.  It took a little while for the setting to disappear, but it seems to stay away during IIS restarts now.
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