If I have a Family Pack and I upgrade my accounts MobileMe Calendar, will anything change for the other accounts in my Family Pack subscription?
No, only the account that upgrades will be changed to use the upgraded MobileMe Calendar. Other Family Member accounts will be unaffected; these individual users need to upgrade as well if they want to use MobileMe Calendar. Note: Family Pack sub-accounts created after October 14, 2010 automatically use the upgraded MobileMe Calendar.