We have 2 new employees and they both are using MS Office 2010. The other employees are using MS Office 2007. The 2007 users can see each other's calendars and the 2010 users can see everyone's calendars. However, the 2007 users are unable to see the 2010 Calendar's. We received an erro message each time that the calendar can not be verified. Is there a setting we need to change?

Thanks for any help - this is very frustrating!