What version of BE do you want to use on your server?
BE Versions: 2.0 and below can run on ASP.net 3.5 but not any version above BE 2.0 it has features that requires Asp.net 4.0
I believe BE 2.5 has lots of "Baked" in 4.0 features that would require lots of changes to get it to work on a 3.5 server.
So with your requirement of only having 3.5 your best bet is to use BE 2.0.
Hasan82: A question for you why isn't 4.0 a feasible option for you?
Just wondering to see if there is any way I could help you with that issue.
Hope this helps answers your questions.
If not and no one else has reply you can all ways contact me.
Kbdavis07@yahoo.com Either through Email or MSN Messenger.
Have a great day!!