Outlook display name not updating
Select the account you wish to update, and then click the "Change" icon.
var microsoft = microsoft
Update the "Your Name" field under the "User Information" heading to include your display name as you'd like it to appear in the "From" line of any messages you send.
A few our customers have experienced an issue with Office 365 whereby their user names are being displayed as i:0#.f|membership| This email address is being protected from spambots.
Microsoft have confirmed this is a known issue with the timer job that is supposed to update the names in your Share Point site collections with the information in the User Profile Application.
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The account name itself stays the same such that the Display name is always "intern -new name" but the addy is "intern".