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Unable to open Thunderbird

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Thunderbird has been working great for years. Now it will not open. Error message "couldn't load XPCOM"

Thunderbird has been working great for years. Now it will not open. Error message "couldn't load XPCOM"

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just reinstall from thunderbird.net occasionally update go south and this error appears. Reinstalling replaces the settings that are needed.

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If I reinstall thunderbird will I loose all of my emails and addresses. Is there a way to back up my emails when I can't get into Thunderbird because of the xpcom error

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