I suggest we start with the desktop side, for the following reasons:
1. We can still allow users to remote to those Windows based systems we cannot get rid off immediately, e.g. Pastel and AccPac, it can be installed on central Windows server and allow VNC to various users using Linux desktop.
2. It may not be easy to immediately migrate their server side as they have already invested in many expensive systems which need careful migration strategy, but desktop systems as per 1. above
3. We can realise immediate huge savings on dekstop licenses, Treasury may be happy because desktop licensing was identified as one of their huge costs per annum.