outlook keep getting old server settings from autodiscover
Outlook still trying to connect to old exchange server after change all the dns record and settings to new server, after you make sure all the settings are correct ! have a look at ADSI Edit :
Connect to "Configuration" naming context, then Drill down to: CN=Services\ CN=Microsoft Exchange\ CN=\ CN=Administrative Groups\ CN=Exchange Administrative Groups\ CN=Servers\ CN= \ CN=Protcols\ CN=Autodiscover\
delete the CN=
Good Luck