After updating office365's password, can't login outlook, always let you input password again and again

Question

Dear all,
       This is a real issue in working. User uses win7 and Outlook2007.
The issue is that after updating office365's password, users can't login outlook, always let you input password again and again. Sometimes, we can fix the issue by deleting current outlook profile then create a new one. But sometimes the method can't work.
What is the root reason?
Many thanks,
Franklin hong

Answer 1

Hi Franklin,
Firstly, please make sure you can access the mailbox with the new Password in OWA. Then check your Account settings in Outlook 2007:
Click Tools > Account Settings. In the E-mail tab, double click the Exchange account. Click More Settings > Security > Select Negotiate Authentication > OK.
Please try to clean up the cached credential in your computer. Then fill in with the format of UPN when it prompted for credentials next time and check the Remember my credential to save it. About how to remove cached credentials, please follow these steps:
1. Launch the Credential Manager from Control Panel > All Control Panel Items > Credential Manager.
2. In the Generic Credentials section you’ll see a setting for [MS Outlook] which will include your SSO details. Click the downward-pointing arrow to the right of that value.
3. In the expand details, click Remove from vault. Then Outlook will no longer have a stored copy of your password.
Thanks,
Winnie Liang
TechNet Community Support