Hello forum, Thunderbird 128 64 bit, win11 Pop and Imap. Every time you open TB, a window opens: TB Email needs access to your Google account. This gives Mozilla Thunderbird Email the following permissions: More information Access, edit, share and permanently delete all calendars available via Google Calendar Click here for more information. Reject Allow This despite the fact that all calendars in TB have been deleted, there is no Google account in TB and TB does not exist as a third-party app in Google Security. Where else could this error be hidden? Thank you if you think of anything