Find mailbox creation date

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If you need to check when a user’s mailbox was created, you can easily do this using Exchange Online PowerShell. This is useful for troubleshooting, auditing, or understanding the lifecycle of a mailbox.

Step 1: Connect to Exchange Online

First, connect to Exchange Online:

Connect-ExchangeOnline

You’ll be prompted to sign in with an account that has the necessary permissions.

Step 2: Get the mailbox creation date

Run the following command to retrieve the mailbox creation date:

Get-Mailbox user@contoso.com | Select-Object WhenCreatedUTC,Name

Example output:

WhenCreatedUTC             Name
------------------------   ---------
2020-01-10 08:45:12        John Doe

The WhenCreatedUTC property shows the exact date and time when the mailbox was created in Exchange Online.