I'm installing a new computer; I moved from Jessie to Stretch on that occasion; in both cases using Icedove with the Iceowl calendar extension. IMAP e-mail setup was zero work, but now I need to get my contacts and the calendar entries from the old to the new computer. How would I do that?
Partial answer for the calendar:
- in old computer's Icedove. Menu > Events and Tasks > Export... creates and .ics file.
- copy file to new computer. There in Icedove, use menu Events and Tasks > Import...