Exchange certificate error using office 365

I'm trying to track down an certificate error on most of our machines. When outlook opens, version doesn't seem to matter, an error saying the name on the security certificate is not valid. The name on the certificate is EXCHG03.ourdomain.com. We use office 365 as our exchange hosting but the error indicates we use to have an exchange server. Digging through AD Sites and Services, I found references to Microsoft Exchange in the services section. I also found references to EXCHG03 under the Microsoft Exchange section. I found the following article http://techhead.co/removing-exchange-from-active-directory/ doing previous searches for a fix, but I'm worried if I try this it will effect our current office365 exchange server.

Does anyone know if this would be safe? Will it solve the issue of outlook security certificates?

I believe the exchange server was 2003.
Currently have 2 AD servers, with a 2008 R2 system as FSMO master and the other system 2003.
Desktops with the issue range from XP-Win7 and Outlook 2003-2013.
Michael-ITAsked:
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Simon Butler (Sembee)ConsultantCommented:
Where does the host name resolve?
If the server isn't alive, it could be that the host name resolves somewhere it shouldn't do, and finding the DNS entry and removing it will deal with the probelm.
Does that server still exist?

To answer your specific question, removing the remains of Exchange shouldn't harm Office365, as long as you don't touch any DNS entries that point to Office365 of the synchronisation tools (if any).

Simon.
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