How to locate a Script that is impacting Outlook 2010

We have Exchange 2010  as email server and Outlook 2010 as email client.
Outlook 2010 Calendar permissions has Default and Anonymous users.
Default user permission level  for some reason keeps switching back to Reviewer, even when I set it up manually to free/busy time.

There is no policy in Exchange 2010 or GPO set up to change the Outlook permissions.
The only thing I might think of is unknown script  somewhere that keeps changing the permissions of the Calendar.

I wonder if there is a way to Track where the Script is coming from ?

Any help will be very much appreciated.

Thank you
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SandeshdubeyConnect With a Mentor Senior Server EngineerCommented:
Please let us know is this issue coming for all users or specific have you check the schedule task on the client computer.You can also check the event log on client computer(application/system log) you may get evidence to troubleshoot futher.Run rsop on cleint computer to check if any orphan policy is causing the issue.When is the permission getting changed while logon or there is no time specific.See below link too.

Understanding How to Read a Userenv Log – Part 2
jskfanAuthor Commented:
I did not have this Entry, just created it.

Does that mean next time there is a change I can check Userenv.log file located in the %SystemRoot%\Debug\UserMode folder  and find the change?
jskfanAuthor Commented:
I do not see anything happening after I created the Entry
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jskfanAuthor Commented:

ok I followed the link above and it created gpsvc file , after I ran gpupdate /force..

I need to go through the file, and see if there is anything relevant to my issue.
jskfanAuthor Commented:
BTW, I checked pretty much all over to see which causing the change and could not find anything.

I had to set up a lab to simulate our environment...
I installed exchange 2010 sp3  and outlook 2010 on windows7
so user calendars in outlook, have the Default user with permission of Free/busy time.

in the production environment the permissions for calendar Default user is Reviewer.
I can change it today to something else for instance :Free/busy , and tomorrow it will revert back to Reviewer.

it  got to be a script scheduled somewhere.
jskfanAuthor Commented:
I found the script...............Thanks
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