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Outlook 2016 - security certificate issue when opening outlook

mmj1
mmj1 asked
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Last Modified: 2020-02-11
I have Office365 locally installed on a PC with the email account setup as IMAP.  All was working ok but now have a few issues:
1) When opening Outlook frequently (not always) getting a send/receive error - usually a reboot will correct
2) Yesterday - started getting the following message:  "Internet Security Warning" - The server you are connected to is using a security certificate that cannot be verified..... do you want to continue using this server.

I have two different email accounts setup in Outlook (one goes through Yahoo servers and the other through Total Server Solutions (previously Hands On Webhosting) - both accounts are setup as IMAP.

Any help is appreciated!  Thank you.
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