Removing Legacy Server Exchange 2013

We installed a Exchange 2013 server and migrated everything over.  Recently my client split off and took only the new server and I can't get the old server anymore.  What is the best way to remove the legacy items still showing on the new server?  I already created a new SSL certificate, but worried about issues from just removing it from the new server.
Daniel BryanNetwork EngineerAsked:
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SaberSupport Escalation EngineerCommented:
The proper way is to run through the uninstall process. But if that is not a viable option you may just want to open ADSIedit and just delete the server object from AD which should remove everything pertaining to that server.

Backup the server object FIRST before deleting if that is the route you pursue.
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Daniel BryanNetwork EngineerAuthor Commented:
Thank don't have the option currently to get the old server and bring it back online, it's been 2 weeks since this happened and I just noticed it was showing up on the newer server.  Figured remove everything related to the old one.
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Daniel BryanNetwork EngineerAuthor Commented:
Figured out the issue was picking a outside DNS server and causing issues.  Removed the outside dns server and everything went back to good.
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Daniel BryanNetwork EngineerAuthor Commented:
after troubleshooting and searching the internet found responses not posted to this question.
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