Hi Kenr,
As I understand, your password had expired three weeks ago, you changed the password at Office 365 portal. Now Outlook client promotes you to enter password and even entered the password you still can’t log in. Am I right?
At first, I suggest try to fix your account in Outlook client:
To do this, click File on the top, click Account Settings and select Account settings, select your account name, click Repair, follow the wizard to try fixing the issue.
If any error occurs, please capture the error message and post it in this thread.
If the problem still persists, I’d like you can try the following things to narrow down the issue:
1, Test to create a new Outlook profile and see if you can configure your account in the new profile.
To do this, click Start, click Control Panel, select Mail, click Show Profiles, click Add to create a new profile, select “Promote for a profile to be used”.
For more information about creating a new Outlook profile, please refer to http://support.microsoft.com/kb/195719.
2, Perform the Autodiscover test with the Remote Connectivity Analyzer, if any error occurs, please capture the report and post it in this thread for the further troubleshooting.
Thanks,
Evan Zhang