NitroDesk Touchdown Version???

I use the paid version. If you are on a 2.1 OS version then this is the proper combo: Exchange for Android 2.x and the license is Exchange by TouchDown Key.

It's the most expensive app I have but it has worked flawlessly for me since April 2010 through every update. I use it for work e-mail so I am especially fond of the ability to set the polling and notification hours and days of the week. I don't have it looking for mail between 6pm and 7am during the week and never on the weekends. If I am desperate enough to see work email during those times i can always do a manual sync.

 

That's the key to unlock Touchdown. This is what you buy but you also need the app itself which are the other 2 items that you listed:

Select the one that matches your device. Froyo is Android 2.2 so that should be a straighforward decision for you.

 

I'm a bit surprised you haven't heard back from them. I've had to contact them for support a time or two and they've always responded promptly to me.

 

Same.

Happy Touchdown user here.

I like that my work contacts/calendar are still there for easy access, but they don't get merged into my Android contacts/calendar.