XADM: Encryption Does Not Work in Public Folders

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To be able to send a message to a public folder, the public folder must have the Hide from Address Book check box in the Advanced tab cleared for that public folder's property page in the Microsoft Exchange Administrator program or you must know the one-off address. After this is done, the users can select the public folder as a recipient from the global address list.

If users have Advanced Security enabled, they can send an encrypted message to a public folder. If they do, then only the mailbox that originally sent the message can open that encrypted message.

No warning dialog box appears when sending an encrypted message to a public folder and other mailboxes that try to open the encrypted message receive the following error message: