Using Exchange 2010 Management Shell:
Change RPCClientAccessServer Attribute to be FQDN of Exchange 2010 Mailbox Databases (repeat for all Databases on Exchange 2010)
Set-MailboxDatabase –Identity “<Database Name>” –RPCClientAccessServer “<servername>.<internaldomain>.local
Using Exchange 2010 or 2013 Management Shell:
Change SCP Object for Exchange 2010 to Point to Exchange 2013 (repeat for all Exchange 2010 CAS Servers); set this to whatever your internal AutoDiscover namespace is.
Set-ClientAccessServer –Identity “servername” –AutoDiscoverServiceInternalURI https://outlook.domain.com/autodiscover/autodiscover.xml
Using Exchange 2010 Management Console:
Set Exchange 2010 Outlook Anywhere to NTLM (repeat for all Exchange 2010 CAS servers)
EMC-Server Configuration-<servername>-Right Click-Properties-Outlook Anywhere Tab- Change Authentication method to “NTLM”
Using Exchange 2013 Management Shell:
Temporarily adjust Authentication Method on Exchange 2013 Outlook Anywhere to be NTLM (required for users on Exchange 2010)
Set-OutlookAnywhere -Identity “<exchange2013cas>\rpc (Default Web Site)” -InternalClientAuthenticationMethod:Ntlm -IISAuthenticationMethods Basic,Ntlm,Negotiate -SSLOffloading $false
Once Exchange 2010 has been removed and uninstalled, run the following command to reset authentication.
Using Exchange 2013 Management Shell:
Adjust Authentication Method on Exchange 2013 back to Negotiate
Set-OutlookAnywhere -Identity “<exchange2013cas>\rpc (Default Web Site)” -InternalClientAuthenticationMethod:Negotiate -InternalClientAuthenticationMethod:Ntlm -IISAuthenticationMethods Negotiate -SSLOffloading $false
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