K9 already exists today if you want to switch which is "thunderbird for android" with a different name, but what do you mean with sync feature? That it shows notifications, or fetches all your email for offline reading or so?
Basically, Firefox Sync allows you to sync certain things across your devices (bookmarks, tabs, etc) and they are going to implement similar functionality in Thunderbird.
Basically, Firefox Sync allows you to sync certain things across your devices (bookmarks, tabs, etc) and they are going to implement similar functionality in Thunderbird.