I installed this on iMac as well as Mac Book Pro. It fails to sync conversations at all. I uninstalled and then reinstalled with no joy. Disabled the firewall still fails. Disabled AntiVirus and it still won’t work. It will send ok, but that is about it. I am at a loss. It does work fine in Windows10 on my surface pro3! Is there no way to force a manual sync of the messages as opposed to just the contacts?