OP 7.4 support on Windows 2016
According to official system requirements for OP 7.4 the installation and hosting on Windows 2016 is not supported.
All necessary components like JAVA, WebSphere Application Server 9, Cognos Analytics 11 are compatible with Win2016.
OP 7.4 as application is working on JAVA level there is no sensible reason to not support OP7.4 on Windows 2016.
Platforms Win2012 and Win2012R2 (which are supported for OP hosting) will reach the end of Microsoft support on October 2018.
High - Critical