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

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
Houston BlancettAsked:
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Cliff GaliherCommented:
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.
Houston BlancettAuthor Commented:
So I'm safe by just deleting those entires?
Cliff GaliherCommented:
In DNS? Yes. But, as always, have a backup. I
I've seen people get in trouble because they got delete-happy and ended up deleting an entire zone or other records.

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Windows Server 2012

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