http://blogs.msdn.com/b/dgoldman/archive/2008/02/02/looking-up-free-busy-information-in-a-mixed-org-e2k3-e2k7-will-return-a-4004-error.aspxFor companies that have a mixed 2003/2007 environment and fall under one of the following states might see problems when querying legacy Free/Busy information: Companies that are in the middle of a migration. Companies that have already migrateden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/dgoldman/archive/2008/02/02/looking-up-free-busy-information-in-a-mixed-org-e2k3-e2k7-will-return-a-4004-error.aspx#7560682Sat, 09 Feb 2008 15:32:09 GMT91d46819-8472-40ad-a661-2c78acb4018c:7560682subject: exchange<p>Business Email System Penetration Varies Greatly by Customer Size, Industry and More, says Ferris Research</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=7560682" width="1" height="1">http://blogs.msdn.com/b/dgoldman/archive/2008/02/02/looking-up-free-busy-information-in-a-mixed-org-e2k3-e2k7-will-return-a-4004-error.aspx#7397697Sat, 02 Feb 2008 22:30:44 GMT91d46819-8472-40ad-a661-2c78acb4018c:7397697MSDN Blog Postings » Looking up Free/Busy information in a mixed org (E2K3/E2k7) will return a 4004 error.<p>PingBack from <a rel="nofollow" target="_new" href="http://msdnrss.thecoderblogs.com/2008/02/02/looking-up-freebusy-information-in-a-mixed-org-e2k3e2k7-will-return-a-4004-error/">http://msdnrss.thecoderblogs.com/2008/02/02/looking-up-freebusy-information-in-a-mixed-org-e2k3e2k7-will-return-a-4004-error/</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=7397697" width="1" height="1">