[There's a reason that Yoda is the unofficial mascot of SBS. Size indeed matters not.] So What A/V can you run on SBS Essentials? - THE OFFICIAL BLOG OF THE SBS DIVA
Sat, Jan 28 2012 23:10 bradley

So What A/V can you run on SBS Essentials?

Security program support in Windows SBS 2011 Essentials environments:
http://support.microsoft.com/kb/2663776/en-us?sd=rss&spid=1167

Note You cannot install Forefront Endpoint Protection 2010 or Microsoft Security Essentials on a server that is running Windows SBS 2011 Essentials.

10 or fewer client computers

If your Windows SBS 2011 Essentials-based network has 10 or fewer client computers, we recommend that you install Microsoft Security Essentials on the client computers. Microsoft Security Essentials is a free download for up to 10 client computers, and it provides real-time protection against viruses, spyware, and other malicious software. For your Windows SBS 2011 server, we recommend that you install a third-party antivirus solution.

11 to 25 client computers

If your Windows SBS 2011 Essentials-based network has 11 to 25 client computers, we recommend that you install Forefront Endpoint Protection 2010 on the client computers. For your Windows SBS 2011 server, we recommend that you install a third-party antivirus solution.

We are currently researching how to support our security products in future releases of Windows SBS Essentials, and we will post more information in this article when it becomes available.

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# Really???

Monday, January 30, 2012 9:37 AM by Joe Raby

How come you can't install FEP?  Does FEP no longer support file servers, or is it that it won't install on a DC?  You used to be able to install Forefront Client Security (the old version of FEP) on a file server, and this was a supported scenario.  It would even install just fine on a DC, although the management server was designed to be installed on a separate server (it's too heavy for lighter SMB AD servers anyway, and it's fairly expensive to boot).