Dear Community, I have a LAN connected desktop Windows 11 computer using Thunderbird 140.10.0esr (32-bit) synced to two different Apple calendars with no issues. I also have two Wi-Fi connected laptop Windows 11 computers using Thunderbird 150.0 (64-bit) each synced to the same two Apple calendars above. I haven't had any sync issues with these until lately and I believe they are setup exactly the same as the desktop computer above. For example if I attempt to "Add" a calendar entry I will get the following error message: "If you're seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add edit events for, you can mark this calendar as read-only to avoid such experience in future. To do so, get to the calendar properties by right clicking on this calendar in the list in the calendar or task view." I have tried removing the calendar and adding it back but I still get the same intermittent sync issues and get these type of error messages. I have no extensions. Not sure if this might be a software bug in the latest 150.0 (64-bit) release because 140.10esr (32-bit) appears to work fine on my desktop computer. Any suggestions would be greatly appreciated. Many thanks.