"Office 12" BETA2 was released for public download earlier this week. I installed it earlier today, and haven't had any problems with it. I have to say that the user interface looks smooth! I especially liked the "SmartArt"-feature which enables you to create good-looking illustrations quickly.
Download it here: http://www.microsoft.com/office/preview/beta/getthebeta.mspx
2007 Microsoft Office system preview site: http://www.microsoft.com/office/preview/default.mspx
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The opinions expressed herein are my own personal opinions and do not represent
my employer's view in anyway.