How to get Windows Mobile Device Center to recognize my T-Mobile MDA?

With XP Pro, I used ActiveSync 4.2 with my phone/PDA. As this does not
work with Vista, I did not attempt to reinstall it and used "Windows
Mobile Device Center" (WMDC) in place.

However, when I plug in my phone/PDA, it doesn't see it no matter what
I try.

Q1> Any secret formula to get WMDC to work with the T-Mobile MDA?

Q2> I also sync in my office via am IR device (office runs XP Pro).
Can I sync both locations even though one is on Vista while the other
is on XP Pro?

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The Traveller
Oceanside, California