Important: end of February, I'm stopping the legacy sync service with Exchange/Office365. If you use the Windows8/WindowsPhone8 version of 2Day, sync will stop working... If you use the Windows 10 version, you might need to reconfigure sync settings.
@starostin13 Found the root cause, some dlls were ignored during import to GitHub, sorry about that. I just pushed a fix, please let me know if that works :-)