Adding a calendar from a 365 user/resource to an on-prem user can be troublesome. Equally, adding a shared calendar to your iphone can be handy. This is easy to do once you've done it once.
Outlook 2011 for mac is proving to have a few interesting features, the ability to reply with just an extract from an email simply is one I really like. No cut and paste.
New in the long awaited Office 2011 for Mac is a whole new Communicator client.
Want to use OCS, but have a mac or maybe Ubuntu... no problem, here's how.