This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

THUNDERBIRD SEEMS TO BE FALLING APART

  • 1 reply
  • 0 have this problem
  • Last reply by christ1

more options

I'm about to find a new mail client...now when I manually try to download my mail from ANY outlook server I get a certificate warning that when I try to get or make an exception since I've had these outlook email addresses for eternity, won't cooperate. it says "you are about to over ride how Thunderbird identifies this site. legitamate sites such as banks, stores or other public sites will not ask you to do this." then shows the location of outlook.office365.com:993 and says " this site attempts to identify itself with invalid information." then says "unknown identity" "the certificate id not trusted because it hasn't been verified as issued by a trusted authority using a secure signature" then asks if I want to permanently store this exception but when I click "confirm security exception" it apparently doesn't work because I still keep getting that message... Oh and I can go through a browser and Windows mail and they both work just fine. It's only through thunderbird I have these issues..help

I'm about to find a new mail client...now when I manually try to download my mail from ANY outlook server I get a certificate warning that when I try to get or make an exception since I've had these outlook email addresses for eternity, won't cooperate. it says "you are about to over ride how Thunderbird identifies this site. legitamate sites such as banks, stores or other public sites will not ask you to do this." then shows the location of outlook.office365.com:993 and says " this site attempts to identify itself with invalid information." then says "unknown identity" "the certificate id not trusted because it hasn't been verified as issued by a trusted authority using a secure signature" then asks if I want to permanently store this exception but when I click "confirm security exception" it apparently doesn't work because I still keep getting that message... Oh and I can go through a browser and Windows mail and they both work just fine. It's only through thunderbird I have these issues..help

Modified by toysmost

All Replies (1)

more options

What is your anti-virus software?

Click the 'View' button in the exception prompt. This opens a Certificate Viewer window. Please post a screenshot of the Certificate Viewer window with the Issuer information visible. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Helpful?

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.