If you are running your own help desk (as many large organization do), you can now provide your own help desk details to your Office 365 users.
To do so, just logon to the Office 365 Admin portal and hit your tenant/company name (top right of the admin portal, just below you name)
Then hit the Custom Help Desk link and fill as appropriate for you
The next time your users will logon onto Office 365, if they click the Question Mark on the left side of their picture, they will get your help desk details
