I have had couple of people asking for this, so I thought I’ll write it here. There is a Blackberry Connect client available for the Treo 750v, you can get it at:

Blackberry Connect for Treo 750v

You need:

Install Files:
Für BlackBerry Internet Service™ und BlackBerry Enterprise Server™ ("desktop" installer – 16.5MB) herunterladen.

Manual
BlackBerry Connect Hanbuch herunterladen.

The English manual is located .here

I checked the manual and still there is no PIN messaging, just Calendar and Email sync. So it has not much of appeal to me. But, could be interesting for