No apology necessary for your English - your have explained your issue
why not expand the Linux platform with additional servers ?
If your manager is set on windows , I would not install 2008 now that 2012 is available.
you may also be able to export the user details from Novell and import into Active Directory (AD) - its been a long time since i worked with Novell (3.12)
If you have Pcounter maintenance - get in touch with support about changing from linux to windows