[There's a reason that Yoda is the unofficial mascot of SBS.  Size indeed matters not.] Step 35 - deleting the DNS entries in the source server - THE OFFICIAL BLOG OF THE SBS DIVA
Sun, Jan 30 2011 23:48 bradley

Step 35 - deleting the DNS entries in the source server



Delete DNS entries of the Source Server for Windows SBS 2011 Standard migration

After you decommission the Source Server, the DNS server still contains entries that point to the Source Server. Delete these DNS entries.
 To delete DNS entries that point to the Source Server
1.    On the Destination Server, click Start, click Administrative Tools, and then click DNS.
2.    In the User Account Control dialog box, click Continue.
3.    In the DNS Manager console, expand the server name, and then expand Forward Lookup Zones.
4.    Right-click the first zone, click Properties, and then click the Name Servers tab.
5.    Click an entry in the Name servers text box that points to the Source Server, click Remove, and then click OK.
6.    Repeat step 5 until all pointers to the Source Server are removed.
7.    Click OK to close the Properties window.
8.    In the DNS Manager console, expand Reverse Lookup Zones.
9.    Repeat steps 4 through 7 to remove all Reverse Lookup Zones that point to the Source Server.

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