This is an update to the Beta 2 version of a 2007 Microsoft Office system product. Beta 2 Technical Refresh updates are compatible with the Microsoft Windows Vista Release Candidate 1 pre-release product.
Discover the latest update to the 2007 Microsoft Office system Beta. We’ve listened carefully to your feedback and have developed a technical refresh with significant performance improvements and redesigns to address your needs and to enhance your user experience. Please note that the Beta 2 Technical Refresh extends the life of Beta 2, which you need to install first. The refresh is recommended if you’d like to use Beta 2 in combination with Windows Vista Release Candidate 1 (RC1).
News source: Microsoft.com