Thanks . I have found KB4012212 Security Update Only and KB401215 rollup update just have to decide which to install . Our support tech has always said , DON'T MESS WITH IT ! . Unless we had a problem , he saw no need to install any of the Nortel / Avaya PEPS unless they were a critical rollout or was related to something that we used . This has seemed to work well for us as we haven't had any issues since Symposium version 1.0 was installed many years ago . Upgrades were done along the way until the last at 6.3 , since then there has barely been so much as an annual reboot . Personally , I see little risk for the WannaCry in this environment but someone on the security team noticed this during an audit , now they are on my back to add the patch . I see more risk by installing the patch and praying it doesn't break anything on the server or app .