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You didn't actually ask a question. But yes, this is perfectly normal. Because windows servers are designed to work in heterogeneous environments where BIND or other DNS servers, as well as other non-windows and non-AD machines live, DNS does not just arbitrarily remove records, even during a migration. That is a manual step. You can and should clean up old entries.
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You didn't actually ask a question. But yes, this is perfectly normal. Because windows servers are designed to work in heterogeneous environments where BIND or other DNS servers, as well as other non-windows and non-AD machines live, DNS does not just arbitrarily remove records, even during a migration. That is a manual step. You can and should clean up old entries.

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So I'm safe by just deleting those entires?
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So I'm safe by just deleting those entires?

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I have a customer with a new Windows Server r2 running Essentials role. Everything migrated from old Windows SBS 2003 server. New server DNS manager still shows IP of old demoted (and now retired) server.<br />
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I checked in DNS and there are some entries that are still listing the old SBS server as a DNS server complete with the (now inactive) IP address of the old server.<br />
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DNS, New Server, Forward Lookup Zone, old server (showing as an Alias (CNAME)<br />
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DNS, New Server, Forward Lookup Zone, Domain Name, old server (showing as an Alias (CNAME)<br />
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DNS, New Server, Forward Lookup Zone, Domain Name, _msdcs, old server showing as a name server
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I have a customer with a new Windows Server r2 running Essentials role. Everything migrated from old Windows SBS 2003 server. New server DNS manager still shows IP of old demoted (and now retired) server.

I checked in DNS and there are some entries that are still listing the old SBS server as a DNS server complete with the (now inactive) IP address of the old server.

DNS, New Server, Forward Lookup Zone, old server (showing as an Alias (CNAME)

DNS, New Server, Forward Lookup Zone, Domain Name, old server (showing as an Alias (CNAME)

DNS, New Server, Forward Lookup Zone, Domain Name, _msdcs, old server showing as a name server

New Windows Server 2012 r2 DNS manager shows demoted and retired Windows SBS 2003 DNS info

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.