hi i have some great difficulties to install the prerequisites for update 1. The msi spawns an error code which would indicate that it has already been installed. So how can i check if update 1 is already in place. The FEP client about menu shows : Forefront Endpoint Protection Version: 2.1.1116.0 Antimalware Client Version: 3.0.8402.0 Engine Version: 1.1.8202.0 Antivirus definition: 1.123.1596.0 Antispyware definition: 1.123.1596.0 Policy Name: Reporting Server Default Policy Policy Applied: 4/11/2012 at 3:11 PM

Hello Benwijs, The Version number for Forefront Endpoint protection 2010 (rollup1) is 2.1.1116.0. If your Version number is 2.1.1116.0, your Forefront should have rollup 1 installed. BTW, this forum is for Exchange related issue, for the question about "Forefront", please use the following links which would be the most relevant forum for your question: Forefront Forum http://social.technet.microsoft.com/Forums/en-US/category/forefront Thanks, EvanEvan Liu TechNet Community Support