>>http://www.pcmag.com/article2/0,2817,2493962,00.asp

Both labs report that you can't cherry pick a single test as PC Mag just tried. You need to assess performance over (say) a year because performance can fluctuate and it's no comfort that your product scored 100% in one test if viruses sneak aboard at other times when performance is only 58%. So here's Dennis Lab's report for the 2015 year: http://www.dennistechnologylabs.com/reports/s/a-m/2015/DTL_2015_AR.pdf

And for servers: http://www.dennistechnologylabs.com/reports/s/a-m/2015/DTL_2015_Q3_Ent.1.0.pdf

"As noted, the free, tiny Microsoft consumer product managed AAA certification for the first time. However, Microsoft System Center Endpoint Protection, the Enterprise-level product, completely tanked. It didn't even score well enough to merit certification at the C level. Most of the other products came in at the AAA level, a couple at the A level."

Curious- my understanding was that Defender now included the Security Essentials' engine that was now shared across all products. In any case it would be great if MS has sorted out its act in which case the 2016 report should be a lot better. Have to say though: after years of under performance, not everybody will want to move away from products that reliably get AAA rating every year. It's not as if Antivirus costs the earth. I got a 10-device Norton 360 on Amazon daily special this year for $25.