AD Domain has no DNS Suffix

We are in the process of some major upgrades.  One of which is upgrading AD and Exchange.  Our current AD is 2003 native with 2 2012 R2 DCs.  Exchange is 2003 running on a 2000 server.  One of the tasks we need to accomplish is raising the functional level of the domain.  This concerns me because, when you look at the AD domain in DNS, it has no suffix.  For example, instead of it looking like abc.local, it is simply abc with no .local, .com, .net or anything.

How will this impact Exchange 2010 and AD 2012 R2.  Has anyone seen this?  It looks like a previous upgrade went awry.

Thanks in advance for your thoughts.
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DrDave242Senior Support EngineerCommented:
That's a single-label domain name. It's probably been around for a while, as all recent versions of Windows either warn you when you try to create a single-label domain or prevent it outright.

The article linked above provides a lot of additional info, including what needs to be done if you want to keep the domain like that, but honestly, your best bet in the long run will be to either perform a domain rename (which will only be possible if you're running Exchange 2003 SP1 and haven't yet installed Exchange 2010) or create an entirely new and properly-named AD domain, then migrate everything to it.

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JadedFanAuthor Commented:
Great answer.  I had forgotten about single-label domains.  What about the 2012 DC's.  Will there be any issue with those?  The renaming article provided above only discusses 2003 and 2008.
DrDave242Senior Support EngineerCommented:
No, there won't be any issues with them. The domain rename process is the same in later versions.
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