Single-Label Domains (SLDs) and the Next Version of Exchange

I’ve written several times about the inadvisability of having an Active Directory domain name that has a single-label. My most recent article was Wrapping Up SLDs and Exchange Server 2007 in April of 2008.

At that time, Ed Beck of Microsoft wanted to assure me that if customers found bugs, they should report them and Microsoft would investigate the issues and address the issues based on the standard engineering review decision process within Microsoft. That is, Microsoft was’t closing the door on fixing problems with SLDs in Exchange 2007.

Now, the next version of Exchange, which is code-named E14, is in development. Yesterday, Ed emailed me and told me that Microsoft released a forward-looking statement indicating that they are investigating the SLD policy for E14 (Ed authored the article on the MS Exchange Team Blog: Next version of Exchange and Single Label Domain (SLD) policy under review).

I guess if I were you – and using an SLD – now would be the time to make yourself known! Feedback is accepted on the Exchange Team Blog site for quite a while after a posting. Let them know your opinion!

Until next time…

As always, if there are items you would like me to talk about, please drop me a line and let me know!

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1 Reply to “Single-Label Domains (SLDs) and the Next Version of Exchange”

  1. Posted: 2008-11-19 13:01:43.013

    Hello Michael,

    This blog post ( was pointed out to me and I have one question for you. In your follow up comments you have this statement:

    1) They’ll support it – but will not change things that don’t work with it

    I don’t recall writing that Microsoft will not make any changes to fix problems associated with a Single Label Domain. I just re-read my posts on the subject and do not see any mention of fixes. If I give that impression I’d like to correct it.

    If a customer has a problem with Exchange 2007 operating on an SLD they should report the problem to Microsoft. As with other reports, if a workaround is not found, or if the customer would like to raise it as a Design Change Request, the issue will be triaged by the Sustained Engineering team. The result of that triage will depend upon several factors, and would be accepted or rejected.

    If I gave the impression that Microsoft would not fix any bugs associated with an SLD I apologize, that was not my intention.

    Ed Beck

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