Now that I have atleast 3 different active e-mails accounts, and after hearing from friends how someone’s gmail account got hacked and they lost their account, installed Thunderbird. Set up all the e-mail accounts.
Been using gmail calendar and wanted to be able to access that too from Thunderbird.
has a nice step-by-step instructions on how to get your google calendar into Thunderbird. Get the add-ons from the Thunderbird menu, so the right versions are installed. Non-compatible versions of Thunderbird, Lightning and gmail provider can cause conflicts.