When a recipient is hidden from the GAL, the recipient is not included in the OAB when the Exchange server generates the OAB. If an Outlook client has Cached Exchange Mode enabled, the recipient is not listed in the OAB. Therefore, the typical methods to access a shared folder do not let a user select a hidden user from the OAB.
To enable the LegacyExchangeDN (legdn) value in this scenario, follow these steps:
- Install the Exchange Server 2010 update. To do this, apply the following update: 2685289 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 2
- Install the Outlook 2010 update. To do this, apply the following update:2687351 Description of the Outlook 2010 hotfix package (Outlook-x-none.msp): August 28, 2012
After you install both updates, you can use Outlook 2010 to open the shared folders of a hidden mailbox. To do this, follow these steps:
- In Outlook 2010, click the File tab on the Ribbon, and then click Open.
- Click Other User's Folder.
Note To open the shared folder of a hidden recipient, you must provide the LegacyExchangeDN value for the hidden user. This attribute value can be obtained from your Exchange Server administrator. Outlook recognizes the entry as a LegacyExchangeDN and resolves the entry against the GAL and not against the OAB.
Important This is the only dialog box in which the LegacyExchangeDN value can be used to open a hidden user's shared folders from. You cannot use the calendar module dialog boxes to open a shared calendar from an Exchange recipient that is hidden from the GAL.