Can I get a sharepoint calander offline?

Using Exchange and my PDA

[Receptional]

We use a group calander in Sharepoint. In Outlook it shows up in "other calanders", but I can't seem to make it my default calander.

I have just put pocket Informant on my PDA and I want to be able to:

See my calander offline
Have my PA able to update my calander
Have all the staff being able to see the calander in Sharepoint

I'm pretty sure I have all the bits to do this, but at the moment the calander is the Sharepoint group calander. Can I get this to be my PDA offline calander?