Disjoint name space question

I'm working with an organization where the Active Directory domain name and primary DNS suffix are both:

wxyz.com

For some reason, the NetBIOs name of the domain is:

XYZ

So users can logon with this NetBIOS name\username combination:

XYZ\jsmith

Technically, I believe this is a disjointed namespace.

Question: is any remedial action necessary before migrating from Exchange 2007?

I see that for other disjoint namespace scenarios, one would have to modify the msDS-AllowedDNSSuffixes attribute on the domain controller container or adjust the DNS suffix search list.

Since this is a NetBIOs name (not DNS), is there anything to do?

I've looked at a number of sources (for Exchange 2010 and 2013)...

http://technet.microsoft.com/en-us/library/bb676377(EXCHG.140).aspx

http://technet.microsoft.com/en-us/library/bb676377(v=exchg.150).aspx

But don't see any action to be taken for a NetBIOS name.

This discussion seems to imply that there is no problem:

http://social.technet.microsoft.com/Forums/exchange/en-US/13f9b284-87a2-4d0b-8a56-1e336414ed53/disjoint-namespace-netbios-name-question?forum=exchange2010

Thanks in advance!

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