A week ago, we encountered an issue which is quite similar as described in Article ID: 958781 (http://support.microsoft.com/kb/958781/en-us#appliesto), with the exception that we're using Exchange 2007 and Outlook 2007. Thus, I'm not sure whether the problem is also affecting Exchange 2007. I have a user (the boss) who is an iPhone user, who delegated his Outlook mailbox to his assistant. On Sep 21, the assistant (only a PC user) happened to change one of her boss' recurring meetings. The change was reflected in her boss's Outlook calendar, but not in the meeting room (resources). So, when we open up the calendar of the user and meeting room, it doesn't tally. We did a test to book the meeting room at that time and it was successful. Please let us know what went wrong as we don't have a clue about it. Do let us know if further information is needed. Thanks in advance for the help!

When the reoccurring appointment was changed did the update get sent to the resource mailbox. Do you have cache mode enabled in Outlook?MCITP: Enterprise Messaging Administrator 2007/2010 | MCITP: Server Administrator | MCTS: Windows Server 2008 Applications Infrastructure, Configuring | MCP | MCDST

No, I don't think so as it is not showing up in the resource mailbox when we opened it. That was why we did a test to book the meeting room at the same time and it was successful. The boss is using Exchange cache mode because he is a laptop user while his assistant (PC user) is also using cache mode. Appreciate your soonest reply. Thanks.

I have this same issue with both Exchange 2007 SP2 and Exchange 2010 SP1 with Outlook 2007 clients. All affected users are high-level managers with deletegates with a mix of Blackberry and iPhone devices and reoccuring meetings will just dissapear completely.