EDIT 10/27/2009: Please see the updated statement on this subject here.
Please be advised that Single Label Domain (SLD) support in the next version of Exchange is under review.
In February 20...
Updated Jul 01, 2019
Version 2.0
Blog Post
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Next version of Exchange and Single Label Domain (SLD) policy under review
I agree with Meelis. I inherited and SLD problem and would love a tool to fix it.