Microsoft Corp. today announced availability of the public betas of Microsoft Exchange Server 2007 and the new Forefront Security for Exchange Server. Exchange Server 2007 builds on the leading e-mail, messaging and calendaring server with new features for improved security, remote and mobile access, compliance management and unified messaging. Forefront Security for Exchange Server helps provide advanced protection against viruses, worms and spam, and is the first product available under the recently announced Microsoft Forefront brand for business security products.
Exchange Server 2007 beta 2 delivers the following:
Forefront Security for Exchange Server beta delivers the following:
Download: Exchange Beta 2
Download: Forefront Security for Exchange server beta
View: Microsoft Exchange Server 2007
Exchange Server 2007 beta 2 delivers the following:
· Built-in protective technologies enable confidential business communications while helping to meet compliance regulations.
· Increased productivity for employees is enabled by anywhere access to e-mail, voice mail, calendars and contacts from a variety of clients and devices.
· New levels of operational efficiency are possible through capabilities that optimise hardware and networking investments and features that help increase productivity for administrators.
Forefront Security for Exchange Server beta delivers the following:
· Advanced protection against viruses, worms, phishing and other threats by utilising up to five anti-virus engines simultaneously at each layer of the messaging infrastructure.
· Optimised performance through coordinated scanning across edge, hub and mail-server and features such as in-memory scanning, multi-threaded scanning processes and performance bias settings.
· Centralised management of remote installation, engine and signature updating, reporting and alerts through the Forefront Server Security Management Console.

From what I read the x86 version would be available for testing, but you would have to install the x64 version for production use.
Only time will tell if they are actually planning on forcing a 64 bit hardware/os upgrade to run the new exchange version. My bet is that they will have both available this time around. It would not be smart to try and force everyone to do a hardware refresh. If so, most companies will stick with Exchange 2000 or 2003.
So we will have a new Dell PowerEdge 2950 (64-bit capable) for Exchange 2007 in January 2007.
Sad to see them just supporting 64-bit only by the time Exchange 2007 is released, but if we can get some software support for 64-but by that time, I have no problems supporting IT to implement it in my company.
Also, convincing most of the western world to switch to X64 won't be too difficult, but I wouldn't be surprised if Microsoft is making sure the code builds correctly for X86 just in case they need to choose between selling Exchange 2007 in developing countries or not selling anything at all.
Beta 2 setup instructions at msexchangeteam blog
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