To save a specific mail, or a range of mails, right click the results window.
This presents a drop-down menu with the following options:
Open Message
Save Message(s)
Forward Message(s)
Export message list
As HTML document
As CSV document
As MS-Excel Document
Save Result List
Open Result List
Results can be saved by right-clicking. Note that a range of messages can be selected. Previously saved result list can be opened.