How to create an Outlook Profile for a Hidden Mailbox

Suppose you wanted to create an Outlook profile for a hidden mailbox and, for whatever reason, you do not want to unhide it from the Address Book just long enough to create it. All hope is not lost! ( Unless you are using Outlook 2016). You can do it using the LegacyExchangeDN.

1. Use adsiedit or your favorite LDP viewer/query tool and copy the LegacyExchangeDN of the hidden mailbox. ( I still prefer adfind to this day).

The LegacyExchangeDN value is a property of the user’s object in AD and will be in the form of:  /o=Contoso/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=UserA

2. Create the Outlook profile. It will fail and you will be at the dialog box that shows server name and the users’ mailbox.

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3. Remove the “=SMTP: User@contoso.com”  value of the  “Mailbox:” and paste the LegacyExchangeDN value you copied from Step1.

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4. Hit Check Name and it should resolve and allow you to create the profile and access the mailbox.

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This is with Exchange/Outlook 2013. This does not work with Outlook 2016 from what I have seen:

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