Using the New Outlook for Mac for personal email and calendar
Hi
Thank you for confirming.
Since Contacts and Calendar are not populating and “New” is greyed out, please first update both macOS and Outlook to the latest version. Microsoft recently documented an issue where older Mac/Office versions can enter “reduced functionality mode,” which prevents creating new items:
https://support.microsoft.com/en-us/office/lifecycle/officeinstall/update-m365-office-macos-ios
Then restart Outlook and check again.
If it is still blank, please sign in to https://outlook.live.com and check whether your Contacts and Calendar appear there.
If they appear on the web but not on the Mac, remove and re-add the account in Outlook > Settings > Accounts. If they are also missing on the web, they are likely stored under a different account/provider rather than this Outlook account.
If you tell me whether the email address is Outlook/Hotmail, Gmail, iCloud, or another provider, I can narrow down the correct sync method.