New updates for your OCS 2007 R2 environment were released a couple of days ago.
Get it from here: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=b3b02475-150c-41fa-844a-c10a517040f4
More information: http://support.microsoft.com/kb/968802
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio