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I cancelled today's update because it said it was incompatible with Lightning Add-on (calendar)

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I use Thunderbird and the Lightning Add-On as the nearest affordable equivalent to Outlook since Microsoft now charge excessively to include Outlook in Office. That means I use the Calendar and all its functions alongside the Email application. That in turn means that I do not want any update to Thunderbird that is incompatible with the Lightning Add-on. Can Mozilla not update both at the same time? I will not install any update that renders the calendar functions unusable. How can I know that an update will work properly with the Lightning Add-on? How can I ensure data in the Calendar (Lightning Add-on) is not lost? Can I roll back updates if something goes wrong? In sum, why not integrate Lightning and Thunderbird as one single application, and update it as such? Up to now, I have liked Thunderbird, and would like to keep it up to date. Please make doing so user-friendly. Current version is 38.7.2.

I use Thunderbird and the Lightning Add-On as the nearest affordable equivalent to Outlook since Microsoft now charge excessively to include Outlook in Office. That means I use the Calendar and all its functions alongside the Email application. That in turn means that I do not want any update to Thunderbird that is incompatible with the Lightning Add-on. Can Mozilla not update both at the same time? I will not install any update that renders the calendar functions unusable. How can I know that an update will work properly with the Lightning Add-on? How can I ensure data in the Calendar (Lightning Add-on) is not lost? Can I roll back updates if something goes wrong? In sum, why not integrate Lightning and Thunderbird as one single application, and update it as such? Up to now, I have liked Thunderbird, and would like to keep it up to date. Please make doing so user-friendly. Current version is 38.7.2.

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In sum, why not integrate Lightning and Thunderbird as one single application, and update it as such?

As of Thunderbird 38 this is the case. I.e. there is always a compatible Lightning version, and the Lightning update happens along with the Thunderbird update. The warning you see may be a little confusing in that regard. https://support.mozilla.org/en-US/kb/thunderbird-calendar-integration

How can I ensure data in the Calendar (Lightning Add-on) is not lost?

Even if something goes wrong with the update your calendar data will not be lost. Having said that, it is good practice to create a full backup of your Thunderbird profile prior to an update anyway, as well as on a regular basis. http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Backing_Up_and_Restoring

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In sum, why not integrate Lightning and Thunderbird as one single application, and update it as such?

As of Thunderbird 38 this is the case. I.e. there is always a compatible Lightning version, and the Lightning update happens along with the Thunderbird update. The warning you see may be a little confusing in that regard. https://support.mozilla.org/en-US/kb/thunderbird-calendar-integration

How can I ensure data in the Calendar (Lightning Add-on) is not lost?

Even if something goes wrong with the update your calendar data will not be lost. Having said that, it is good practice to create a full backup of your Thunderbird profile prior to an update anyway, as well as on a regular basis. http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Backing_Up_and_Restoring