Old Exchange server still showing up - Problem?

I inherited a small network that is currently running two Windows 2008 R2 domain controllers and single Exchange 2010 server for our mail.  Everything seems to be working as it should, however I have seen references to a previous exchange server in the Exchange application log, mostly related to a default address book issue.  I really want to migrate our DCs to 2012 R2, however digging around Exchange, I'm finding more pieces to the previous exchange server which was 2003. Sure enough (Get-ExchangeServer | Format-List) shows two servers.  EX and EX1.  The old server no longer exists and was deleted long ago.  How can I now remove these references without disrupting our current server?  Also, since that is a 2003 exchange that was installed, is there a danger by migrating to Windows 2012 R2 - since it is surely not supported?  Again, I haven't noticed any issues with our current Exchange server, other than a stray reference to the old server in the application logs.
Fred BranhamSr. Network EngineerAsked:
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Guy LidbetterCommented:
Hi Fred,

It sounds like the old exchange environment was not properly decommissioned. Open up ADSI Edit configuration container and look under
CN=Configuration,DC=DOMAIN,DC=LOCAL
CN=Services
CN=Microsoft Exchange
CN=EXCHANGE_ORG
CN=Administrative Groups

The CN=First Administrative Group folder is exclusively for 2003, and newer Exchnage install will be under CN=Exchange Administrative Group (FYDIBOHF23SPDLT).

Any old server information under there should be removed (They should be empty if properly decommed). That should solve your issue.

Regards

Guy

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