It's out officially now. Download it here : http://www.microsoft.com/downloads/details.aspx?familyid=4b106c1f-51e2-42f0-ba32-69bb7e9a3814&displaylang=en&tm

Improvements:

• Enhanced viewing experience for charts in Excel Mobile.
• Ability to view SmartArt in PowerPoint Mobile.
• Ability to view and extract files from compressed (.zip) folders.
• Microsoft Office Mobile 6.1 Full Version to support Microsoft 2007 file formats