The laptop has had an 1and1 hosted Exchange account installed on for several years (RPC over HTTP).
The user has decided to switch from 1 and 1 to Office 365 for their hosted Exchange accounts.
I have deleted the 1and1 Exchange Outlook Profile and created a new Office 365 Profile.
When the Outlook Autodiscover wizard "Searches for <emailaddr> server settings" a dialogue box appears stating "Welcome back to Exchange.1and1.co.uk" and prompts for a password.
The Office365 password doesn't work, as Outlook appears to still be trying to get to 1and1.
I have renamed the 1and1 ost file.
I have renamed the directory that the ost file is stored in.
All Outlook Profiles have been deleted from the Control Panel "Mail" applet.
The Office 365 account works correctly on other computers that have not had 1and1 Profiles on them.
I have searched the registry for "exchange.1and1.co.uk" but nothing is found.
How can I remove the reference to 1and1 from the users system?