Hello Guillermo,
The Jornada 720 requires a different SDK. It can be found here,
http://www.microsoft.com/downloads/release.asp?ReleaseID=30269
After setup, please review that known issue section of the readme file.
There is a registry entry that must be made on the device or the SDK will
not work with the device.
I hope this information helps.
John Soulis
Microsoft eVB Developer Support