I've been wanting to play with Office Communication Server for a while now but I just never had the time to setup a complete test system. A colleague pointed out that there is a free hosted UC Trial available that can be setup in minutes! Wow! So I've been playing with OCS 2007 R2 and am impressed! Expect more on OCS here but in the mean time here is your link to a free hosted OCS 2007 R2!