I have recently been put in charge of my company's new online Office365 environment. One of my first tasks was to fix a users email address capitalization. For some reason when their user profile was originally created it was made "ALLCAPS@company.com". I want to make his email address "firstname.lastname@example.org" to match the case of all other company emails.
I was able to utilize the "Set-User" PowerShell command with the "-name" parameter to edit most of the user's mailbox information so that it is lowercase. This command did fix things like the alias and other areas where it had ALLCAPS. It did not, however change the "User ID" as shown below in the Exchange Online admin GUI. This user still shows as ALL CAPS in our global address book and other areas of Outlook365. User ID is greyed out here so I assume there is another PowerShell command that I must use to edit this to be lowercase?
Let me know if there is any other info you need from me to help resolve this. Thanks!