I am researching whether we should upgrade to Netware 5.1 or Netware 6 to be used with GroupWise 6. Are there any known problems with Netware 6 running GroupWise 6? Is one more stable than the other? Also, how difficult is it to upgrade GroupWise 5.5 running Netware 4.11 to GroupWise 6 running on Windows 2000?