Hi,
You can run the following cmdlet in Powershell to export the attributes to csv files and compare the attributes of a mailbox-enabled user and a mail user.
Get-Aduser -identity <username> -Properties * | Export-csv C:\temp\temp.csv
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.