I upgraded our Exchange 2007 system to Exchange Server 2010 SP1 recently. Unfortunately there is no Search Folders through OWA. In Outlook 2010 it is there.
I checked the segmentation settings both on OwaMailboxPolicy and OwaVirtualDirectory level, both are correct, searchfoldersenabled is true.
The only Default OWAMailboxPolicy is assigned to the mailbox.
None of the mailboxes have Search Folders through OWA. I tried to move the mailboxes to new database, I recreated the OWA virtual directory, restarted everything. None helped. I have no further idea what to check, what to set.