Logs still show RPC traffic after migration to Exchange 2013

We have just done a migration from Exchange 2010 to Exchange 2013 and all mailboxes are now running on the 2013 server. Checking the logs on the 2010 server before I decommission it, I have found that the client access log is still logging entries for some of our users:
1/09/2015      0:00:00      exch2010IP      HEAD      /rpc/rpcproxy.dll      Exch2010.###.local:6001      443      ###\user      Exch2013IP      MSRPC      200      0      0      0

If I shut down the 2010 server, the users who this is logging for don't have any issues with their mail at all, but I see the following being logged on the 2013 server:
1/09/2015      6:07:18      Exch2013IP      RPC_IN_DATA      /rpc/rpcproxy.dll      Exch2010.###.local:6001&CorrelationID=<empty>;&RequestId=a17e028d-9d3f-4f27-86e0-71585cd75a04&cafeReqId=a17e028d-9d3f-4f27-86e0-71585cd75a04;      443      ###\user      MSRPC      -      503      0      64      63170
1/09/2015      6:07:20      Exch2013IP      RPC_OUT_DATA      /rpc/rpcproxy.dll      Exch2010.###.local:6001&CorrelationID=<empty>;&RequestId=d95ce424-0a0e-45d5-baf2-72e196f1e511&cafeReqId=d95ce424-0a0e-45d5-baf2-72e196f1e511;      443      ###\user      MSRPC      -      503      0      64      21027

When I did the migration I did have the two servers running in co-existence with a receive connector on the 2010 server for mail from the 2013 server. Once all the mailboxes were all migrated across, both servers are using the same autodiscover and outlook anywhere url, but all the dns records were updated to point to the new server.

Is there something I have missed in the migration that would be causing some users to be trying to still hit the 2010 server for RPC?
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Amit KumarCommented:
When you shutdown Exchange 2010 server and there is no issue with new env. then there is no issue.

Make sure you have moved System and Discovery mailboxes from Exchange 2010 to Exchange 2013.

What I feel you did not change Exchange 2010 URLs to legacy one, in other mean you are using same URLs for Exchange 2010 and Exchange 2013 with DNS load balance so in that case there are chances to hit some traffic on your old env.  It is just assumption. However you can do random tests connect some of clients and then right click on Outlook ICON in tray and run Test configuration and see what it shows to you.

Or you can run Netmon to monitor traffic if clients are connecting to Exchange 2010, if you just want to see connections then run netstat -n. It will show you all connections.
jaylaaAuthor Commented:
Checking the connection status on a couple of machines I've noticed that they are trying to connect to the 2010 server for public folders, which we don't use.

When having a look at the public folders on the 2010 exchange there is Internet Newsgroups under Default Public folders and then EFORMS REGISTRY, Events Root, OFFLINE ADDRESS BOOK, SCHEDULE+ FREE BUSY, schema-root and StoreEvents under the System Public Folders. Do any of these need to be migrated or will users outlook stop trying to access them once I remove them from the 2010 exchange?
Amit KumarCommented:
First check if your Exchange 2013 DBs are using Exchange 2010 public folders?

Get-MailboxDatabase -ID "MailboxDB" | ft Name, *PublicFolder*

As you dont need them so do one thing, create one Public Folder in Exchange 2013 and change public folder client setting on new DBs.

Set-MailboxDatabase -Identity "MailboxDB" -PublicFolderDatabase "PublicFolderDB1"

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