This post has moved: http://bradmarsh.net/index.php/2008/05/07/open-2007-documents-on-your-wm5-and-wm6-pdas/
Some thing you should know:
• At least 6 MB of Available Storage on your device or storage card
• ActiveSync 4.5 (on Windows 2000/XP/2003); Windows Mobile Device Center (on Windows Vista)
The rest is easy.