Hi,
Thank you for the post.
According to the description, I understand the problem you are experiencing is whether Hotfix Rollup 3 for Forefront Security for Exchange Server Service Pack 1 is compatible with Exchange 2007 SP1 and Exchange 2007 SP2. If anything misunderstand, please let me know.
Yes, it’s ok. You can also install Forefront Security for Exchange Server Service Pack2 on Exchange 2007 SP2. If you want to check the Hotfix Rollup Pack, please refer to the following description and check the File version.
http://support.microsoft.com/default.aspx/kb/951629
Regards,
Nick Gu - MSFT