Excerpt from the post on the EBS blog by general manager Eric Kidd:
I’d like to do two things right off the bat in this, my first, blog post here… 
1) Announce that Windows Essential Business Server 2008 has reached RTM! (English now, more languages to come soon)
2) Extend my sincere gratitude to the many customers, MVPs, users, partners and enthusiasts that helped us build what we hope proves to be an exceptional product.  Thank you.
The team (at Microsoft and extended by the community mentioned above) has been hard at work on this for a long time – Beta 1 shipped in December 2006 – and we’re now very close to general availability (GA) when we’ll have the privilege of hearing from customers what they like and what we can make better.  The final step in release comes with our November 12 product launch (previously announced), which kicks-off GA.  See Eric Watson’s earlier blog entry describing the difference between the RTM and GA milestones. 
Carlene Chmaj