> hi,
> We have a huge web application written in ASP 3.0 (and still currently under
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> server) or IIS 6.0 which has built-in .NET framework (on win2003 server and
> which edition?).
It really doesn't matter, but if you're starting new I would go with Windows
Server 2003. Compare the features for each version and get the lowest
(least expensive) one that meets your needs.
> 2. We have VID/VSS/IIS integrated environment for source code version
> management. Will we able to maintain the same environment with ASP and
> ASP.NET pages under single application and do the check in/out process as we
> normally do today without any difference?
Yes. See these great references:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/tdlg
_rm.asp?frame=true
http://support.microsoft.com/default.aspx?scid=kb;en-us;328845
> 3. Can the Application and session variables (and hence the session) be
> shared between the ASP and ASP.NET pages? (like for instance the connection
> string application variable). Ideally, i want the ASP and ASP.NET pages to
> behave in a similar fashion so that we dont have to develope separate code
> in ASP.NET which does exactly the same as the ASP pages do to maintain
> application/session environment. how is it possible?
They cannot be shared directly.
> 4. Can i run Visual Studio 6.0 (for VB 6.0 and VID 6.0) and VS.NET (for
> VB.NET) and their related MSDN versions in parallel on a single machine? I
> suppose that my developers will need to switch between the two enviroments
> occassionally. are there any know issues with this configuration and is it
> safe to do so?
Yes.
> 5. Which platform should be used for development puspose ? win2k pro (which
> is our current platform) or winXP ?
It doesn't matter.

Signature
Tom Kaminski IIS MVP
http://www.iistoolshed.com/ - tools, scripts, and utilities for running IIS
http://mvp.support.microsoft.com/
http://www.microsoft.com/windowsserver2003/community/centers/iis/