http://blogs.technet.com/provtest/archive/2008/12/26/hmc-4-5-and-exchange-2007-sp1-part-3-internal-and-external-out-of-office.aspxInternal and External OOF in HMC Environment So, the 4th main customization that HMC introduces to Exchange 2007 is the OOF Transport Agent. What is OOF? Here is the text book definition, "The Out-of-Office (OOF) feature is commonly used by end-usersen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/provtest/archive/2008/12/26/hmc-4-5-and-exchange-2007-sp1-part-3-internal-and-external-out-of-office.aspx#3173948Sun, 28 Dec 2008 02:54:34 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3173948Cloud Feed &raquo; Blog Archive &raquo; Daily Cloud Feed - Dec 27, 2008<p>PingBack from <a rel="nofollow" target="_new" href="http://cloudfeed.net/2008/12/27/daily-cloud-feed-dec-27-2008/">http://cloudfeed.net/2008/12/27/daily-cloud-feed-dec-27-2008/</a></p>