An update has been released to the backward compatibility MP's for Operations Manager 2007. These MP's are installed by default during a Management Server install and to update them you will need to import the new MP's extracted by this MSI. The updates affect management packs using the MOM 2005 backwards compatibility module (ie. converted MOM 2005 MP's).

http://www.microsoft.com/downloads/details.aspx?FamilyID=655cdd06-861e-4342-99b2-8a81e09f6546&DisplayLang=en

The Update addresses:
- New Backward Compatibility Threshold monitoring type using in Converted MOM 2005 MPs which exposes Threshold values as overrides.
- Fixes to the Backward Compatibility Cluster discovery to address problem with converted MPs that monitor clustered Applications