I'm new to Thunderbird. Today I installed and exported ALL my data from Outlook for Mac. I then used Olminator to successfully convert to eml and ics files for import to Thunderbird. The eml file import for my email worked great, as did my contacts. However, when I try importing the resulting ics file, I get this error: If you’re seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add or 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've tried importing to the 'Home' calendar, and also creating a new calendar for the import but nothing works. Any assistance would be greatly appreciated. Thanks.