http://blogs.technet.com/b/mbaher/archive/2011/02/05/the-official-stance-on-address-list-segregation.aspxCopied from http://blogs.msdn.com/b/dgoldman/archive/2011/01/28/the-official-stance-on-address-list-segregation.aspx?wa=wsignin1.0 &#160; Since the early days of Exchange Server our customers have used various methods to provide different views of theen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/mbaher/archive/2011/02/05/the-official-stance-on-address-list-segregation.aspx#3443566Tue, 26 Jul 2011 18:10:40 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3443566Ralph<p>We want to use nulty tenancy but we also use Lync 2010 and we need to have UM,</p> <p>Exchange 2011 multy tenancy does not have UM</p> <p>What should we do?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3443566" width="1" height="1">