Wow. This came out quietly. And it’s only SLIGHTLY IMPORTANT.
Anyone that wants to read anything created in Office 2007 Beta 2 Technical Refresh while using Office 2000/XP/2003 will need this update. The previous File Format compatibility pack that you could install in Office 2000/XP/2003 no longer works and you have to use this pack which is specifically written for Beta TR.
Seriously: Download it and use it. Or at least keep this link to it. You don’t want to be in a situation where you can’t read a document just because you don’t have the Compatibility Pack installed.
DOWNLOAD: http://www.microsoft.com/office/preview/beta/converter.mspx
Kurt Shintaku's Blog 