How do I merge several Thunderbird Calendars?
I have Thunderbird installed on my Windows 10 Desktop PC. When I open the Calendar tab, in the left column under "Calendars" I have four calendars showing:
- My Calendar
- one labeled with my e-mail address.
How can I get rid of three of them without losing the data? Is it possible to merge them into the "My Calendar" one? Thanks in advance.