Outlook Calendar Synchronization Issues

Hi all,
We are experiencing an issue with Microsoft Outlook where new meetings, and also changes to meetings, are
not always appearing in the calendar view of the meeting organizer. Outlook clients are a mixture of 2010 & 2013 (Outlook Anywhere), Exchange is 2007 and hosted (not with Microsoft),
resource accounts are resource/room accounts rather than user accounts. Clearly the problem is either client or server side, but as our Exchange is hosted it's impossible to gain any real insight in to potential server side culprit. However,
I will be passing this same information on to the company hosting our Exchange (not Microsoft). So I'm really looking for assistance in trying to determine what the problem is if it is client side. A simple example of this scenario would be:
1. Meeting organizer creates
a meeting request by inviting one user and one room/resource.
2. The meeting is auto accepted by the resource and confirmation is received by the organizer, but does
not always appear in the organizers view of the resources calendar.
3. The meeting is manually accepted by the user and confirmation is received by the organizer,
but does not always appear in the organizers view of the users calendar.
4. The meeting shows correctly in the users webmail view and Outlook view of their own
calendars.
5. The meeting shows correctly in the webmail view of the resources calendar.
What we know about the problem:
1. Recreating the OST will temporarily resolve the problem, although is not a viable long
term solution.
2. Turning cached mode off will resolve the problem permanently.
3. Meeting will sometimes appear after a random amount of time/days
So clearly a problem is with the synchronization of
free/busy information between the server and the OST. I do have advanced log files in .ETL from a session where the problem occurred but can't see how to attach?
Any assistance would be greatly appreciated!

1. Recreating the OST will temporarily resolve the problem, although is not a viable long term solution.
2. Turning cached mode off will resolve the problem permanently.
3. Meeting will sometimes appear after a random amount of time/days
Hi Jan,
Since the issue doesn't happen in Outlook Online mode (uncheck Use Exchange Cached mode) nd recreating the profile would resolve the problem temporarily, the issue should be related to Outlook client.
In Cached mode, please check the following settings in Outlook:
1. Click Account Settings on the File tab.
2. In the Account Settings dialog box, click the Email tab, click to select the Exchange account, and then click
Change.
3. Click More Settings. On the Advanced tab, make sure the
Use Cached Exchange Mode and Download Shared Folders check box have been checked.
4. Finish it and restart Outlook.
If it still doesn't work, please close Outlook and click the Start menu, Run command (Windows key + R), type or paste
outlook.exe /sniff   (Note: Make sure there is a space between the words.)
Then press Enter (or OK button) to restart Outlook to have a try.
Regards,
Winnie Liang
TechNet Community Support

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