[c-nsp] ACS 4.1 migration, anyone ?

[Loc Pham]

    Hello,
   I migrate our test box  ACS 3.1 windows platform to 4.1 ( with help from TAC ).
   Now, the million dollars question: Have anyone  successfully do similar thing and any additional test I need to do ? I would imagine spot checks here and there ( +5000 users / ~ 500 groups ) but may be a more stuff I can verify ?  Thing may just work the way it is but who know ! 
   TIA,
    Loc