The BizTalk load generation utility, originally released by Microsoft several months ago, was quickly removed from their downloads page for enhancement. The enhanced version is now available for download here.

The interesting part is that this tool works with the Performance Tester Tool of Larry Beck (see post below).

Better late then never, but about a month ago Larry Beck released the completed version of the BizTalk Performance Tester (BTSPerfTester). This application is intended to provide developers with an easily implemented and predictable method of determining the maximum sustainable throughput of their BizTalk solutions.

You can get it from his blog here.