The best replacement for novell is microsoft.

The best alternatives to novell are rated as following:
★★★★★  microsoft
★★  active directory
★★  redhat
★  sco
★  red hat
★  windows server
★  microsoft server
★  unix
  red hat linux
  windows 2003

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Speaking about novell, one probably shouldn't forget about groupwise.

Other search terms related to novell and their ratings are:
★★★★★ groupwise
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novell
microsoft
active directory