The target principal name is incorrect

[MarkBPC]

I have started getting an Internet Security Warning message pop up when I first open Outlook 2007. It says "The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect".

The pop server is outlook.office365.com and the smtp server is smtp.office365.com. Ports are 995 SSL and 587 TSL.

Any advice would be greatly appreciated.

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