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Thanks for the feedback.
4 out of 8 people found this post helpful.
Do you mean that when clicking Outlook in Office 365 Online Portal, the error 404 occurred?
To troubleshoot the issue, please log on Outlook Web App via the URL directly. Office 365 users can directly access their mailboxes at the following URLs:
Note: You can’t use "https" in the URL with mail.office365.com.
If there is any error when logging on Office 365 by using the above URL, please capture a screenshot and post it in the forum for further research.
1 out of 1 people found this post helpful.
I would like to follow up with the question you posted previously. Does the reply above answer your question?