Don't forget Active Directory. The older NT Domain directory services system was a nightmare. Novell had a far, far better system with better replication across slow links, and better management tools. It had a better file system, more granular rights (and easier to manage), more logical inheritance rules, and the list goes on. Novell's Directory services was still better than the Windows 2000 version of AD even though MS obviously tried to emulate them.
But Microsoft knew how to market.
BTS