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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 <a href="http://techhead.co/removing-exchange-from-active-directory/" rel="ugc">http://techhead.co/removing-exchange-from-active-directory/</a>&nbsp;doing previous searches for a fix, but I'm worried if I try this it will effect our current office365 exchange server. <br />
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Does anyone know if this would be safe? Will it solve the issue of outlook security certificates? <br />
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I believe the exchange server was 2003.<br />
Currently have 2 AD servers, with a 2008 R2 system as FSMO master and the other system 2003. <br />
Desktops with the issue range from XP-Win7 and Outlook 2003-2013.
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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.

Exchange certificate error using office 365

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.