Auto-accept doesn't work for Office 2010 clients

Server:  Exchange Server 2007 SP3 Update rollup 8

Clients:  Office 2010 and Office 2007

Our entire user environment had been Office 2007 until recently we added a couple Office 2010 installs.

This works well and we've only reported 1 issue.  When an Office 2010 users books a resource it isn't processed automatically and someone has to log into the resouce and accept the invite.  We use direct booking and the resource mailboxes are configured to auto-accept meeting invites and decline conflicts.

Is this a known issue?

Any suggestions on how to resolve?

Thank you