Exchange was deployed without a CASArray, need help with array settings and PRF to fix.

Question

I'm standing up a new Exchange 2010 server to replace old hardware (not going 2013 at this time) and found out the hard way that the person who built the old 2010 box never created a CASArray.  I've created one and applied it to the mailbox DB on the
new server with set-rpcclientaccess and it works fine - I move my own mailbox to the new DB and do a "Repair" to the Outlook profile and then it shows the address for the CAS Arrary within Outlook.
I set up a hardware load balancer for the CAS Array IP address and it shows good connection from both CAS servers, Outlook is connecting through that just fine.
Users are on Outlook 2007 and 2010, almost all 64-bit versions.
Reconfiguring everybody's outlook isn't going to be a practical solution for me - I support a couple hundred geographically-dispersed users most of whom aren't keen to muck about in their Outlook settings.  So here are my questions:
Should I add the mailbox DB on the old CAS server to the array using set-rpcclientaccess or will this disrupt connectivity for all users?
Assuming I need to use a PRF to update client computers, have read several pages on how to create the PRF, but even launching outlook.exe /importprf doesn't fix the value - and /promptimportprf doesn't prompt (I see a brief flash of what is probably the
prompt window but it disappears immediately).  I'm going to paste in the PRF in use exempting sections 5, 6 and 7 which are unchanged.  Where do I correctly need to enter the CAS array value?
[General]
Custom=1
DefaultProfile=Yes
OverwriteProfile=Append
ModifyDefaultProfileIfPresent=true
; Section 2 - Services in Profile
[Service List]
;ServiceX=Microsoft Outlook Client
; Section 3 - List of internet accounts
[Internet Account List]
; Section 4 - Default values for each service.
;[ServiceX]
;FormDirectoryPage=
;-- The URL of Exchange Web Services Form Directory page used to create Web forms.
;WebServicesLocation=
;-- The URL of Exchange Web Services page used to display unknown forms.
;ComposeWithWebServices=
;-- Set to true to use Exchange Web Services to compose forms.
;PromptWhenUsingWebServices=
;-- Set to true to use Exchange Web Services to display unknown forms.
;OpenWithWebServices=
;-- Set to true to prompt user before opening unknown forms when using Exchange Web Services.
[Service1]
HomeServer=cas.corp.mydomain
DefaultProfile=Yes
OverwriteProfile=Append
ModifyDefaultProfileIfPresent=true

Answer 1

If you move a mailbox from one server to another, Outlook will automatically repair the Outlook profile.  Have you tried this, instead of trying to force a profile update using a PRF?