DNS/Mailboxes for subdomain currently on an exchange

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http://serverfault.com – A client currently has emails such as: [email protected] they have these two A records (among others, to different IPs): uk.domain.com mail.domain.com pointing to the same IP address. There is only one mx record - domain.com --> mail.domain.com I believe they are on an exchange at the moment, whether that makes any difference. I am to transfer control of mail to our own server, which is not an exchange. Is this task as simple as: creating a subdomain uk.domain.com and pointing the A records to the IP of the new mail server? (HowTos)