Outlook display name not updating
For Outlook 2010 and previous, changing the display name of the IMAP mailbox is the same as for any other pst-file: Another way to do this in Outlook 2007 or 2010 is to select the Data Files tab in Account Settings and then double click on the pst-file.
When you are using an Outlook.com/Hotmail account in Outlook 2010 or previous via the Outlook Hotmail Connector, you can change the display name of your account in the following way: When you change the display name of an Outlook Hotmail Connector account, the name of the mailbox will automatically change as well.
Changing this setting can take up to 24 hours to process and take full effect.
Your display name in Office 365 is the name that will appear in the "From" field when you send emails.
Users can’t change their own primary email address.
Only an administrator can change a user’s primary address in a Google Cloud or Education account.
Whether that name is misspelled or incorrect, it is important that it be correct, so you need to find a way to adjust it.
When you initially configured your email account in Outlook 2010, you set up several items that affect the way that your mail is sent and viewed.
For instance, when you set the delivery for multiple POP3 accounts to a single pst-file, it doesn’t make sense that the pst-file in Outlook is named after the email address of only 1 account.
Another example is when you have 2 or more accounts and want a more elegant or shorter display name like “Work” and “Private” rather than the full email address.