The Exchange Team has published an issue they recently found in the latest version of the Exchange 2010 MP, version 126.96.36.199.
This issue is serious and has forced the Exchange Team to pull this MP from the catalog.
It shows that a MP can do harm as well. Therefore EVERY MP has to be tested before put into production. However, this issue is hard to detect and when it happens, it’s already a bit late since the end users are affected by it and will start calling your support staff. Only then you’ll know something isn’t OK.
When you are using this version of the Exchange MP in your SCOM R2/OM12 environment check this posting of the Exchange Team. It tells you what issues you might encounter and how to work around them.
Of course are they working on a fix for this unwanted behavior.