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Solution to Lightning on Thunderbird 60:
On this link you will see that Thunderbird 60 requires Lightning version 6.2.
You can download this version from Mozilla here:
I used version "Dir 6.2b6-candidates/" at bottom of page.
Download the .xpi file for you OS (Win, Mac or Linux).
Install via the "Install Add-On from file" from the drop-down menu on the Firefox>Addons>Extensions page.
Works normally. No problems.
Further note for NEXTCLOUD users
Initially it won't sync after upgrade. The solution is simple:
For all Users with Thunderbird 60 problems with Address and Calendar Sync.
----> network.cookie.same-site.enabled = true —> false