Time zone settings for shared mailboxes in Outlook on the web

• Applies to:

  Exchange Online

When you create a shared mailbox, the mailbox isn't immediately assigned a license. This behavior is by design. A time zone isn't automatically set after a shared mailbox is created because users don't sign in to shared mailboxes directly. For information about when licenses are assigned to shared mailboxes, see About shared mailboxes.

To check the time zone setting on a new shared mailbox, sign in to your Microsoft 365 account as a tenant administrator, and run the Get-MailboxRegionalConfiguration cmdlet:

Get-MailboxRegionalConfiguration -Identity "<Shared_mailbox_name>"

Note: In the cmdlet output, fields such as "TimeZone" will have a value of <null> or no value set.

To set the time zone for a new shared mailbox, run the Set-MailboxRegionalConfiguration cmdlet:

Set-MailboxRegionalConfiguration -Identity "<Shared_mailbox_name>" -TimeZone "<Supported_time_zone_key_name>"

For example, to set the time zone to Central Standard Time for a shared mailbox that's named Shared mailbox B, run the following cmdlet:

Set-MailboxRegionalConfiguration -Identity "Shared mailbox B" -TimeZone "Central Standard Time"

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