well, to answer your question more directly then you should really contact customer support and ask. I rather expect they'll tell you no - but it doesn't hurt to ask.
You could also ask one of the many professionals here if they'd be interested setting up the software for you (for a fee).
As far as squirrel mail goes, I personally quite like it. I suppose your car analogy works quite well. Squirrel mail is like a economy import car. There's not many frills, but it's a good dependable product for the price. My Honda worked without any major issues for 10 years (I wasn't the first owner), there was a little rust on the body, and a bolted down piece of plexi glass instead of the moon roof (previous owner tried to open the moon roof while going down the highway and the wind riped it off) but the engine was still in good shape and it got me from A to B day after day. Even across country every summer.
While my Honda wasn't pretty to anybody else but me, it did serve me well.
Anyways, I'm willing to bet squirrel mail is here to stay. but as I said before, we're only customers here - if you want a official response you'd have to contact support.
art.googlies.net - personal website