Office Mobile 6.1 update released for compatibility with Windows Mobile 6 and Office 2007 docs
Microsoft has released an upgrade for Windows Mobile that solves an issue which prevented users of Windows Mobile 6.0 devices from reading documents created by users of Office 2007. This upgrade will let WM6 users view and edit Word documents and Excel workbooks and view Powerpoint slideshows in Office 2007, which are based on the Open XML format. The upgrade also lets Windows Mobile users view and extract files from compressed .zip folders.
Go to this link to get the free download for existing Windows Mobile users who have Office Mobile.
While you're there you may to download the Microsoft Windows Mobile Device Center 6.1 for Windows Vista which is an updated version of WMDC to provide compatibility for Vista and WM6.
Microsoft Windows Mobile Device Center 6.1 for Windows Vista (32-bit)
And there's a flash demo for WM6 available as well:
Windows Mobile 6 Demo
btw, check this out so you don't confuse the Office Mobile 6.1 update with the possible next version of the Windows Mobile OS: http://www.windowsfordevices.com/news/NS8508056769.html