Active Directory and DNS

[hoyoung at us.ibm.com]

>I believe that Jim's suggestion will work.  Delegate these subdomains
>to their own zones:

 >    _msdcs.ourzone.org
 >    _sites.ourzone.org
 >    _tcp.ourzones.org
 >    _udp.ourzones.org

>You can have these zones either on a W2k master or a BIND master (if
>you allow DDNS on these four zones).  These four zones will contain all
>of the SRV records that the MS Domain Controllers need to register.
>The only "A" record that the DCs register is this:

>     ourzones.org  IN  A  aaa.bbb.ccc.ddd

>There is one "A" record per DC, and this one record can easily be added
>to the parent zone manually (assuming that the record does not conflict
>with any existing CNAME entries).

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My problems is that ourzones.org has been used with MX records
(ourzones.org IN MX ....).  I assume this will cause problems if it's been
used by w2k DCs.  What's the work around?

Thanks
Hannah