The product that I personally find the most exciting in the new range from Microsoft has just been released to manufacturing. The Exchange team announced it yesterday in their blog. Exchange 2007 sees some changes in the way it is architected. Finally, Exchange will use the pysical representation of your network that is defined in Active Directory in AD Sites and Services. The installation is component based. And the introduction of Unified Messaging will mean a lot for business users. Being available (only) for x64 means it is also more scalable for those larger customers.
I had a quick look earlier in the beta but didn’t get much time to play with it. I’ve recently read some high level documentation on migration. It’ll be simple enough for consolidated Exchange networks. Complicated Exchange 2000/2003 networks will need to be very well planned due to the fact that there is no longer the concept of a routing group or routing group connector. Exchange 5.5 people have some bad news. There is no longer a direct migration for you folks. You’ll have to step up to Exchange 2003 first.