Adding new AD with the Exchange 2k

For 25 users, its pretty pointless. We have 22,000 users and just have 3 DCs and they are fine.
Of course, a second DC would be more fault tolerant than just one. Just join it to the existing domain when dcpromo'ing it.

I'm with answer # 1 in that having a second DC for redundancy is a good course of action to take, whether you have 25 or 25000 users. A second exchange server tends to be messy setting up . Exchange isn't like a DC where you dcpromo and volia! everything works. There's frontend/backend/connectors/mailbox stores/ to configure and can lead you to take valum and bang your head on the desk not to mention having people boo you in the hallway and throw paperwads at you cuz they don't get mail. Burning your effigy in the parking lot with users carring signs for your ouster tends to get the attention of management as well so reading up on adding another exchange server to your mix is well worth the effort. msexchange.org is a great resource for all things exchange.

Another consideration maybe be to install a second non-DC exchange server and then move all mailboxes to the second exchange server. Then configure the second exchange server to be the only exchange server. Then uninstall exchange from the orginal DC

This is considered a more secure environment for several reasons.

Techkid: Why do you think this a better and more secure environment??

Point value changed by question poster.

It's a more stable secure mail environment because it's a stand alone exchange server and NOT on a DC

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