If a forum is encrypted, you must decrypt its contents before
migrating the forum to Exchange. To decrypt the contents of a
forum, you must have Moderator privileges on the forum. For more
information on decrypting forums, see the Collabra Share
To decrypt the contents of a forum:
On the File menu, click Admin, and then click
Click the Membership tab, click Forums, and then
select the forum you want to decrypt.
Click the Access tab, click Properties, and then
click the Storage Policy tab.
Clear the Encrypt the contents of new contributions for
privacy check box.
Click the Integrity tab, and then click
Reconstruct. All items in this forum are now decrypted and
any new items posted in this forum will not be encrypted.