Outlook 2010/Exchange 2010 Meeting Subjects missing

Good morning,
     We are trying to track down a curious problem.  Over the past number of weeks we have had reports of users receiving internal meeting requests from Co-workers that have a blank meeting subject.  We confirmed in each instance that the organizer did enter a subject, and it shows up in their calendar with a subject; however, the people invited have a meeting invite without a subject.

Now if we have the organizer change the subject and send the update the users then see the subject line.

If the organizer does not change the subject, but changes something in the body and sends an update the other users will then see the subject and the invites then shows the subject line in orange to indicate it has been updated.

I am leaning toward this being a windows update issue somewhere along the line, but I am not sure as this does not occur for every invite send out or every user that sends meeting requests.

  We are running Exchange 2010 standard and I believe we are updated through roll up 8.  Any suggestions would be appreciated
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imkotteesSenior Messaging EngineerCommented:

Are they using any conference room on this instance?
DaveIsHere08Author Commented:
From what I can tell yes they are.  Different conference rooms on several of these issues I believe.

I have my guys logging these instances moving forward.
imkotteesSenior Messaging EngineerCommented:
Ok, few more things.

1. Try removing conference room and check
2. Go to the properties of that conf room --> Resource Information Tab--> Make sure Delete the subject is not enabled.
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DaveIsHere08Author Commented:
Don't have a resource tab, I think these were just set up as mailboxes and the calendar attendant is active, a hold over from the 2003 migration I presume
imkotteesSenior Messaging EngineerCommented:
Just try sending invite by removing conf room, so that you can find where the issue is. If it is with conf room, then convert it to 2010 conf room  and set the necessary attributes properly.
DaveIsHere08Author Commented:
We will test, the issue is it is not consistent.  Also if it has no subject and you change something in the body of the invite and send the meeting update out then the subject magically appears in the update that is sent without changes the subject in the update
imkotteesSenior Messaging EngineerCommented:
Strange, but go step by step troubleshooting. Could be due to incorrect settings or corrupted items.
DaveIsHere08Author Commented:
After testing for a longer period of time there are reports that it also happen without a resource and also sometimes changing the invite and sending an update does not always result in the Subject being sent.
DaveIsHere08Author Commented:
We found this to be do to one of our Outlook plug-ins.  have them run Outlook in safe mode and then work backwards until you find the culprit.  believe ours was our AVG Plug in.

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DaveIsHere08Author Commented:
We were able to figure out the issue on our own.
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