Missing & lost Calendar changes

Our CEO has multiple delegates working with his Exchange mailbox. The problem we are seeing is that when a calendar item is “changed” (usually a recurring event, but possibly not always) by a delegate, not all the invitees get the update on all their devices.  I have seen my CTO get the update within his Outlook client, also visible in OWA, but NOT ever sent to his PDA.  There have also been times when the update was not received at all by some invitees.

On the Exchange server we see Event errors for some of the delegates stating that they have “exceeded the maximum of 500 objects of type "objtFolder"”.

I’ve seen where I could increase the maximum “objects” via the registry… but is this the cause and what problems may I be introducing if I do increase since it applies to ALL users?

These issues may be related or not, but I would appreciate ideas an help on both.
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Glen KnightCommented:
The first step would be to make the registry change.

What mobile devices are you talking about? There is a known issue with iphone software version 3.0 that caused this and updating to 3.1 will resolve it: http://support.apple.com/kb/TS2806
PushingdigitsAuthor Commented:
I Google'd around and eventually found this KB from Microsoft http://support.microsoft.com/kb/969254
After verfiying the version of the EXCDO file, which was fine, I found the suggested registry key to activate the fix was not applied.

After applying the registry key lastnight, this morning I can find no errors in the Exchange Event viewer as I had before. Still waiting on a few users to "poof" thier calendars to see if everything clears up.

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