1: Agent 6.6 is shipped with java 1.8.0_162 (Oracle). If you see supported server for java 8 its only from or above windows server 2008 R2
2: Agent 6.7 shipped with 1.8.0_232 (Adopt Open JDK). The java 8 of adopt have support for
3: Please find support matrix for Oracle and AdoptJDK
4: In theory the agent 6.6 may work on Windows server 2003, However "We don't recommend it?". The very reason we don't recommend it is in case of any issue if we discovered with java on Windows server 2003 (or any unsupported OS i.e. Operating System), we can't expect a fix from JAVA vendor on that. Even in case of extended support for OS, The OS vendor will only be able to provide support at OS level not for Java or any other third party software.
- To baseline minimum supported Windows OS i.e. to Windows Server 2008 R2 for agent 6.6
- To baseline minimum supported Windows OS i.e. to Windows Server 2012 for agent 6.7