Currently running mixed mode between 2003/2008 R2. I have seen the exchange 2010 matrix for funtional levels.
Are there any known issues when installing Exchange 2010 under one forest/domain functional level (ie. 2k3 mixed) then raising the functional level later (possibly months when we can configure all DCs to run at Windows 2k8 R2 functional level)?
From my understanding the Schema prep and AD prep done by Exchange 2010 are one-time. In addition functional levels do not impact applications outside of the domain group (DCs) and are cumulative additions rather than removals. Has anyone encountered such a situation that Exchnage has broken when changing forest functionality. Lastly, is there a document that specifies impact, if there is one?
Thanks! I absolutely agree but is this documented anywhere?
I doubt it.
Microsoft don't document every scenario. If you can't find anything to say it shouldn't be done (because you will not) then it is fine. The only thing Exchange cares about is the minimum level, and as you can't go back, going up isn't an issue.
Simon Butler, Exchange MVP
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