I am busy migrating to Office 365 from my old POP3 account. I have setup 3 users on Office 365 and am able to connect to two of the accounts from Outlook 2007. The third account will not Autodiscover and keeps coming back and asking me for the username and password. The credentials I am supplying are correct as I can log onto OWA with them. I have tried this account on multiple machines and my iPhone but no joy. If I test Outlook Autodiscover on testexchangeconnectivity.com it passes for the first two accounts but fails on the third.
Can someone please advise what I am doing wrong as I am at my wits end.