I have enabled syncing between my PC's Thunderbird google calendar and the google calendar on my A13 5G. It definitely appears to be working correctly: Events entered in either device appears on the other. I have also noted that an entry on the PC's calendar also appears on the Samsung calendar, but an entry in the A13's Samsung calendar does not appear in the PC's calendar??? I find this very interesting, but have no idea what's happening; why the only one-way sync? And, is it possible to get entries in the android's Samsung calendar to register within the PC's calendar? Thanks.