I cant't install lightening on thunderbird

If I tri to install the calendar on Thunderbird, I get the message 'cant install because the security certificate is not valid.  Can anyone help please?  My email is b.drake @ ntlworld.com

Thank you,      Barry Drake.



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9hickman
5/11/2017 7:54:32 AM
mozilla.support.calendar 2521 articles. 0 followers. Post Follow

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