>Can I install both versions of VS (6 and 2005) on the same machine ?
Yes, I had VS 6 and when I installed VS 2005 there were no problems
and both are now working OK.
>I got to maintain two applications (one in V6, one will be in VS2005).
That's, more or less, what I am doing but with seven applications. My
only problem is the lack of class wizard in VS2005 but I'm adapting.
>What about Visual SourceSafe 6d and 2005 ?
>If I install VS2005 Team system (with SourceSafe 2005), can my VS 6 work
>with the VSS2005 ?
I can't help with that as I don't use either.

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Steve Wolstenholme Neural Planner Software
EasyNN-plus. The easy way to build neural networks.
http://www.easynn.com