ActiveSync with Windows Seven

Hello, 

I encounter a problem with the terminal MC55A0 and Windows Mobile devices with Windows Seven.

In Windows XP, it was possible to synchronize the terminal with ActiveSync guest mode (V3.8, V4.2 and V4.5). This option is not available with the manager of Windows Mobile devices.

Registry key that allowed the guest mode is disabled on Windows Seven.

Is there an alternative to this problem ?