Using Outlook for iOS for personal email and calendar management
Hi, I'm John! I will help you with this.
Are you signed in to the same Microsoft account in Outlook on both your phone and desktop?
On your phone, please check the email address under Outlook Settings > Accounts. Then compare it with the account shown in Outlook on your desktop.
Also, what differences are you seeing? For example, are emails missing, folders different, contacts not syncing, or calendar items not matching?
Let me know what you find, and I'll help you troubleshoot further.