If you've not already done so, delete any current reference in your iDrive to the (old) Palm and start over to pair the phone with the iDrive system. I don't know any other tricks to make things work.

I have a Treo 650 (uses Palm OS, not Windows Mobile) and the address book will not load at all. However if I transfer key contacts into the favorites part of the program, those more limited number of contacts will show up. Hope some of this helps!

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BMWs: 2007 X5 3.0
2002 330xi
1991 525i (ret'd)
1985 325e (ret'd)