How do 32-bit BizTalk Server executables run on Windows x64?

Windows x64 provides the ability to run both 32-bit and 64-bit executables on the same computer. 32-bit executables use the WOW64 service to emulate a 32-bit runtime environment.
http://msdn.microsoft.com/en-us/library/aa560166(BTS.10).aspx

BizTalk Server 2009 Standard Edition does not support native 64-bit hosting

BizTalk Server 2009 Standard Edition does not support native 64-bit hosting

Which versions of 64-bit Windows are supported?
All versions of BizTalk Server 2009 support 32-bit execution on Windows Server 2008, Windows Vista, Windows Server 2003 x64 (including R2) and Windows XP Professional x64 by using WOW64. Additionally, BizTalk Server 2009 Enterprise, Developer, Branch, and Evaluation Editions support native 64-bit execution on Windows Server 2008, Windows Vista, Windows Server 2003 x64 (including R2), and Windows XP Professional x64 by installing both 32-bit and 64-bit executables and providing configuration options to use either 32-bit or 64-bit modes. BizTalk Server 2009 Standard Edition does not support native 64-bit hosting.

Maximum Characters allowed in an xml element

Below is an interesting point that I came across today and wanted to add it to the list. I have not validated it. If you have, please leave a comment.

[From: Ganesh Kumar's BizTalk Blog
http://geekswithblogs.net/GaneshKumar/archive/2008/11/15/maximum-characters-allowed-in-an-xml-element.aspx]

Today I found that in BizTalk, there is a maximum limit for the number of characters that can be sent in an XML element. The limit is 50,000,000 chars.