Change Case has been in MS Office for a long, long time. I've used it since Office 6/Office 95. From what I remember Sysreq is System Request and was used on Unix systems back in the day. Probably still used at Telkom...
While MS Office, in terms of compatibility with the rest of the world, is generally easier to adopt and use, it does not provide enough benefits over and above that of Libre Office to prompt me to make the effort to get it to run under Linux.