Shared calender and Groupwise Mobile Server

Customer runs with GW65. They have a shared folder that they use for a
planning. They are happy with that.
Now they would like to get this shared folder on a PDA (via GMS) in order to
check/edit this planning from anywhere.
But as far as I know you can 'map' 1 groupwise-account with the PDA.
Are there other ways? Tricks? Other products?

Regards,

Adrie de Regt
Netherlands