I currently use the Windows Mail app because it gives me everything in one solution but I know that it is going to be replaced.
I can link and unlink inboxes, I can see all my calendars, tasks and contacts synced. I did add my outlook account to see how that would work, and I would love to move to Thunderbird. If it can't be considered by the Thunderbird developers could someone else look at this.
I am looking for desktop solutions that give me the same functionality.