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When MS Outlook (2003/2007/2010) connect to pop3-ssl server and the server certificate is selfsigned it opens a dialog whether or not user wants to accept it. Is it possible to suppress this message like it is with Thunderbird?

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That opens the dialog because it wants to make the user aware that it is accepting a self-signed certificate. Typically if you're using a self-signed certificate in the environment it's important to allow the user to verify it.

That aside -- if you do not have a domain, you can do it manually you'll just have to install the certificate when the pop up appears. You should be able to click 'more details' and then 'Install Certificate'.

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Add the certificate to the computer's certificate store. If your computers are in the domain you should be able to do this by group policy.

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