Hello Guix! First of, many thanks to Jonathan Brielmaier, Nikita, Adrian Malacoda and Ricardo Wurmus; for making Icedove in Guix happen. :-)
When I tried it, I got the following error on opening "Preferences". XML Parsing Error: undefined entity Location: about:preferences Line Number 780, Column 17: <menuitem id="mail-menuitem" ----------------^ Regards, RG.