In what order should I upgrade my PDC and BDC's from 3.51 to 4.0?

A. The two different versions can coexist happily so you can upgrade in order you want however the safest option may be the following schedule:

  1. Upgrade a BDC from 3.51 to 4.0
  2. Leave it for a week and check it is OK
  3. Promote the BDC to the PDC
  4. Leave for another week and check everything is OK
  5. Upgrade the other BDC's to 4.0
  6. Promote the old PDC back to the main PDC (the current PDC will automatically be demoted to a BDC)

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