Exchange 2013 CU2 on Server 2012. Currently mixed with Exchange 2010. Moved my test mailbox to 2013 and Outlook 2013 continually pops up asking for the password.
Based on another thread I tried:
Get-OutlookAnywhere -Server emsrv-Exch1.emcc.edu | Set-OutlookAnywhere -ExternalClientAuthenticationMethod NTLM
But that did not help. Manually changing the client from Anonymous to NTLM helped but I don't want to have to manually change everyone's client. Is there a server setting I can set or maybe a GPO to deploy for the client?