Exchange 2K7 w/ CCR Decommission in Hybrid Environment

Current structure:
2 x 2K13 Exchange (Hybrid Mode w/ O365)
7 x 2K7 Exchange - 2 X MB (CCR), 2 X Hub, 2 X CAS, & 1 X PUB
All MB's migrated; AADSync Ok; All PF's dealt with (converted to Shared MB's); Running Clean for almost 1yr now.

Q1.(General) - We are at the point where we feel all work is being performed by the Hybrid Servers or Cloud Services; What might be the ramification(s) of just powering off the 2K7 boxes and verifying mail functionality for a day, or so, as there are references to Connectors and what not within the 2013 Servers?

Q2.(Specific's): I've found several article re decommissioning 2K7 and have settled on a few that I feel will be best for our situation; however, still seeking feedback/comments on a few items - in no particular order:
A - As our MBS are CCR'd - any feedback on the thoughts of the assumption of breaking the CCR and uninstalling all the PASSIVE Side 1st before continuing on the more formal decommission process of the ACTIVE side; OR, best to break the CCR and decommission the various Roles at the same time?
B - PF's - The article that I've fixed on is a bit confusing; it suggest that no DB's should not be using a PF before removing it; however, we only had 1 PF and all DB's are tied to it and I cannot change/delete that option within the DB configs - not sure what to do here or even worry about it?
C - OAB - There are three (3) listed within the 2K7 EMC with the "Default" set to "True" for the 2013 (Web-Based) OAB; the other 2 that are not set as default, the generating server is the 2K7 Pub Server and the folder of those has current data in them with files that have today's date on some of them. - the article suggest if I don't deal with these that the uninstall will fail - any comments/suggestions here would be helpful?
D - The 2K13 boxes are/were configured in part with the HCW (Hybrid Configuration Wizard) - once the 2K7 boxes are gone, is this still considered an Hybrid environment, my thought is that it is due to having AADSync or is it not and would I need to do something with them after the 2K7 boxes are out of the picture?

I would absolutely and greatly appreciate any comments and/or feedback with the above
Randy
n4mationAsked:
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Todd NelsonSystems EngineerCommented:
What might be the ramification(s) of just powering off the 2K7 boxes and verifying mail functionality for a day, or so, as there are references to Connectors and what not within the 2013 Servers?

You might find out that mail flow stops from external sources (i.e. MFP, applications, etc.)  And that's not a bad thing.


...any feedback on the thoughts of the assumption of breaking the CCR and uninstalling...

Personally, beginning with the passive sight first, I would remove all mailbox roles first, then client access, and finally hub transport.


PF's

Take a look at these references.  I know one is for 2010 but it will provide guidance...


At a high level, I perform the following tasks...
  • Disable/remove public folder references in OAB
  • Dismount and remount PF database
  • Remove all non-system PFs from database ... Get-PublicFolder -Server "SERVERNAME" "\" -Recurse -ResultSize Unlimited | Remove-PublicFolder -Server "SERVERNAME" -Recurse -ErrorAction:SilentlyContinue
  • Remove all system PFs from database ... GetGet-PublicFolder -Server "SERVERNAME" "\Non_Ipm_Subtree" -Recurse -ResultSize Unlimited | Remove-PublicFolder -Server "SERVERNAME" -Recurse -ErrorAction:SilentlyContinue
  • Remove database
  • Delete physical files


OAB

OABs on the Exchange 2007, have to be removed for the uninstall to complete.


The 2K13 boxes are/were configured in part with the HCW

Yes, still considered a hybrid but not just because of AAD Connect but because you configured Exchange 2013 with the HCW.  AAD Connect is a pre-req for hybrid.
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Todd NelsonSystems EngineerCommented:
Sufficient information provided for solution.
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