Unable to Open Shared Calendar

Hi Everyone,

I need some help with a shared calendar. I have created four calendars for our office all of them for booking meeting rooms. Three of the four work just fine but the fourth is being a pain.
I'm running Exchange 2010 and all our clients are running Outlook 2007. I have re-created the meeting room a couple of times just to make sure I hadn't missed anything.
When I, or another staff memeber tries to use the "Open a Shared Calendar" we get the below error.

Any ideas why I'm getting this error?

Sean

Marshalhubs said:

Please follow this discussion on the same issue: Cannot open a user's mailbox from a different account - Spiceworks

Thanks for your input Marshalhubs but I'm having problems with Room mailboxes and not user mailboxes where I can manage the permissions.
It sure is a weird one.

Any thoughts people?