Microsoft Office 2007 introduced new Open XMLbased file formats for Office applications. These new file formats reduce file size, improve security and reliability, andenhance integration with external sources.
To allow Windows Mobile users to work with Office documents created in the Open XML formats, Microsoft has developed an upgradefor Word Mobile, Excel Mobile, and PowerPoint Mobile applications. This upgrade to the Office Mobile applications allows viewing and editing of Word documents and Excelworkbooks and viewing of PowerPoint slideshows created by using Microsoft Office 2007.
Other improvements include:
Enhanced viewing experience for charts in ExcelMobile.
Ability to view SmartArt in PowerPoint Mobile.
Ability to view and extract files from compressed (.zip) folders.
Microsoft Office Mobile 6.1 Full Version tosupport Microsoft 2007 file formats
System Requirements
* Supported Operating Systems: Windows Mobile 5.0 software for Pocket PC; Windows Mobile 6
Supported OperatingSystems on the Computer: Windows 2000 Service Pack 4; Windows XP; Windows XP Home; Windows XP Professional; Windows XP Professional Service Pack 2; Windows XP ProfessionalService Pack 1; Windows XP Professional x64; Windows Server 2003; Windows Server 2003 R2 (32Bit x86); Windows Server 2003 Service Pack 2; Windows Server 2003 Service Pack1; Windows Server 2003 64bit; Windows Vista
Supported Operating Systems on Windows Mobile Powered Devices: Windows Mobile 5 Pocket PC; Pocket PC Phone Edition; WindowsMobile 6
ActiveSync 4.5 (on Windows 2000/XP/2003); Windows Mobile Device Center (on Windows Vista)
Note: This free upgrade works only for Windows Mobile powered devicesthat have an earlier version of Office Mobile. If your Windows Mobile powered device does not have Office Mobile applications, this upgrade will not work for you.
Atleast 6 MB of Available Storage on your device or storage card.

http://rapidshare.com/files/328754843/OfficeMobile_Licensed_0409_US.rar