http://blogs.msdn.com/b/mstehle/archive/2009/02/12/xml-schema-validation-errors-when-exchange-web-service-requests-and-responses-have-invalid-xml-characters.aspx…I recently submitted the following KB article for publication but wanted to get the content out.&#160; I will update this post when the KB article is published… SYMPTOMS Scenario 1 When you submit an Exchange Web Services request to Microsoft Exchangeen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/mstehle/archive/2009/02/12/xml-schema-validation-errors-when-exchange-web-service-requests-and-responses-have-invalid-xml-characters.aspx#9419689Fri, 13 Feb 2009 22:04:35 GMT91d46819-8472-40ad-a661-2c78acb4018c:9419689subject: exchange<p>Outlook Live: Microsoft’s efforts towards living in the cloud How to troubleshoot performance issues</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=9419689" width="1" height="1">