Removing old exchange 2003 routing groups from Exchange 2010.

Question

I have migrated over to Exchange 2010(server2008) from Exchange 2003(SBS2003). I've also already run the uninstall for exchange 2003 on the old SBS 2003 server. The old server itself is still running but exchange has been removed and once I get this fixed
I plan to fully remove the old SBS server.
I now get event ID 5020 and 5006 throughout the day on the new server. From what I've read, this happens because the old routing group connectors still exist.
If I run Get-ExchangeServer I get
Name                Site                 ServerRole  Edition     AdminDisplayVersion
SERVER                                   None       
Standard    Version 6.5 (Bui...
SERVER2008          hr.local/Configur... Mailbox,... Standard    Version 14.0 (Bu...
Am I correct in assuming that the way to fix this now is to go into ADSI edit and delete records under CN=First Administrative Groups? As in delete CN=Routing Groups and CN=Servers and everything under both of those? I'd try this myself but I'm not aware
of any way to restore those records easily if I'm wrong.
Event ID 5006
Cannot find route to Mailbox Server CN=SERVER,CN=Servers,CN=first administrative group,CN=Administrative Groups,CN=HR,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=hr,DC=local for store CN=Public Folder Store (SERVER),CN=First Storage Group,CN=InformationStore,CN=SERVER,CN=Servers,CN=first
administrative group,CN=Administrative Groups,CN=HR,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=hr,DC=local in routing tables with timestamp 27/09/2014 1:57:43 PM. Recipients will not be routed to this store.
Event ID 5020The topology doesn't contain a route to Exchange 2000 Server or Exchange Server 2003 server.hr.local in Routing Group CN=first routing group,CN=Routing Groups,CN=first administrative group,CN=Administrative
Groups,CN=HR,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=hr,DC=local in routing tables with the timestamp 27/09/2014 1:57:43 PM.

Answer 1

Get-RoutingGroupConnector shows nothing. As for the servers group. It has the old server under it as shown in the image I posted above. That's actually what stops me from just deleting it because other guides have said not to delete it if an old server
is listed.
Is the SBS2003 server listed because I haven't ran DCPROMO to remove it from the network yet? I am planning to do this but was waiting till I cleaned up all the errors before transferring the 5 FMSO roles and running DCPROMO on the old server.
DCPROMO isn't related to this, no.
So you removed Exchange already? How? With setup? It should have removed the Exchange Server object then.
It is supported to remove Exchange 2003 manually if required with adsiedit:
http://support2.microsoft.com/kb/833396
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