I have now installed a second solid state drive (thanks to all who offered advice). I would now like to move the Outlook (pst) files.
My reason is that the old SSD is nearly full and the new SSD is nearly empty.
There seems to be contradictory advice on the Internet how to do this, ranging from just moving the file and allowing Outlook to find it again to making the move via the control panel (meaning making the adjustments to the path there). It is claimed the first approach can disrupt Outlook.
I have tried moving the file in the control panel (Mail) but nothing seems to happen. The result seems to be that Outlook cannot then synchronise subscribed folders.