Exchange question - AD with subdomains

[Dashrender]

Here's a question -

Let's assume I have two domains in AD acme.com and AD.acme.com - of course having that root one will potentially cause us a split horizon DNS issue, but I can't remove it for now.

Exchange is installed in the acme.com

All users/computers will be created in AD.acme.com

Can you use a UPN of acme.com for the users in the AD domain?

[dbeato]

@dashrender Yes, you can. But you just need to have the domain added as main in Exchange and you will be all set.