I’ve only had a cell phone for two days which is largely free from Google (LineAge + F-Droid).
For me some things are still Terra incognita.
I use LineageOS (17.1) on one pixel 4XL. In the office we have a Kopano groupware server with Z-Push which is connected to the cell phone via ActiveSync.
For contacts, calendar and e-mail this also works out-of-the-box.
For tasks and notes I used the app Tasks&Notes before de-googleization which synchronized tasks¬es via ActiveSync to the cell phone.
Does anyone know if there is a free alternative for this?