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Adding Custom Attributes to an Office 365 User Mailbox

Feb 13, 2015 by Emma Robinson

Microsoft Office 365 mailboxes include 15 extension attributes that you can use add information about a recipient, such as an employee ID, organizational unit (OU), or some other custom value for which there isn’t an existing attribute.

To add or modify data in these Attributes you first need to log into the Office 365 portal as an administrator.

You then need to navigate to the Exchange Administration Console and select Recipients.

Office 365 Exchange Admin Console

Double Click on the mailbox that you wish to add or modify the custom attributes for and click the More Options… link to show the custom attributes.

Edit Office 365 Mailbox Screen

You can now add or modify these attributes.

Office 365 Custom Attributes
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