Have you set up to use a Gmail Calendar in 'Calendars' ? If yes, then it simply wants you to allow the communication between the gmail server calendar and the synchronised gmail calendar you added. Click on 'Allow'.

Settings > Calendar This is the location to set up the Settings for the default Calendar supplied by Thunderbird. Those settings will also get used for the display of any calendars you have also chosen to link. You will not see a list of calendars in this view.

To see calendars: In far left 'Spaces Toolbar' there will be a 'Calendar ' icon option which you click on to open in a new tab. OR if using 'Menu Bar' toolbar: 'Events and Tasks' > 'Calendar' OR use the shortcut keys 'Alt'+'3'

Do you see a gmail calendar listed?

The default Thunderbird calendar is called 'Home' and it does not ask for passwords. It's just a handy function which you can use for many reasons eg: create an event and set it up to remind you do something eg: Birthdays or Appointments etc.

The google/gmail calendar is something people have if they have a gmail account. Gmail also provide a contact list - all of this is seen via the Google webmail account. However, Thunderbird can also be set up to use that gmail calendar etc. Whether you choose to do it is up to you.

See image below of my calendars.

I have the default Home calendar plus I've hooked up to a gmail calendar, a gmail 'Birthdays' calendar and gmail 'My Tasks'.

Okay, I did the "Alt + 3" option and it DID bring up a calendar but it doesn't say it's gmail or Samsung or Google or anything. At the bottom of the calendar, you can select "Home" or "Contacts" I opened one of these and the menu included "Show All Calendars" so I selected that one but the display of the calendar originally opened remained on the screen and nothing changed, so I guess it's the only calendar I have.

BTW, there are NO events shown on the calendar, I suppose because I didn't even know I had this and I haven't set up any events on the calendar.

Also, sometimes the screen that pops up in Thunderbird doesn't mention a calendar at all. It just says Thunderbird wants to access my Google account and it goes on to say if you allow it, it will delete all of your contacts and I sure don't want to do that.

Joe - Oklahoma

re :BTW, there are NO events shown on the calendar, I suppose because I didn't even know I had this and I haven't set up any events on the calendar.

Events are something you create, so what you are seeing is a blank default Home calendar.

re:Also, sometimes the screen that pops up in Thunderbird doesn't mention a calendar at all. It just says Thunderbird wants to access my Google account and it goes on to say if you allow it, it will delete all of your contacts and I sure don't want to do that.

Access to gmail Email or gmail Contacts or gmail Calendar basically means you have control to manage them via Thunderbird. However you would need to set it up. Nothing deletes anything unless you do it and that includes emails.

Just to reassure you - gmail contacts is a specific address book which you normally only see when you logon to gmail webmail account. It has nothing to do with all the other normal address books in Thunderbird.

There are different gmail pop ups asking to allow Thunderbird access to gmail.

If you say to allow it then it justs sets up an oauth token in the Saved Passwords.

Since there's apparently no way to get rid of the annoying pop-up about every five minutes that obliterates my computer screen where you can't see what you were working on, I will just have to live with it. I thought surely there was some way to get rid of it. It's very frustrating to have to deal with it all the time.

I feel like I'm just wasting your time since there is no solution. Thank you anyway.

Joe - Oklahoma