EXPERT RESPONSE
Do all of these connectors support a clustered setup?
It wouldn't make me comfortable. Why couldn't you just deploy two front-end servers, both standalone? That offers the redundancy and reliability, without clustering. You are just protecting for a motherboard failure with a front-end server. And if you have two, what is the difference? It's not that I'm not a fan of clustering, but I would be concerned if future product roadmaps are going to support clustered connectors.
How will Active Directory handle this, and do I need to extend the scheme for these modified custom attributes in order to make them work?
I would imagine changing the display name of the corresponding extension attribute will just be cosmetic.
Does Site Replication Service handle all this for us or do we need to stay in mixed Exchange mode on the main hub site before the complete organization has been migrated?
If you are in mixed mode, the 30 sites will appear as 30 administrative groups. The default mail protocol in Exchange 2003 is SMTP. You would need to make a decision as an organization to stay mixed mode, or convert to native mode -- this isn't a site by site decision.
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