Is it still possible to contact Microsoft and me on the Longhorn Alpha Testing. Or is it already too late to get my hand on Longhorn

To Late

There never was one to begin with.

You can still try for Beta testing...

You could try searching other boards that discuss LH. Iexbeta, idarkside, etc.
I don't know if this board permits direct links, so I kept the info simple. You have to do some digging yourself.
Or send me an e-mail if you like. I'l help you dig....