This is from the COS > features page:

Deleted Messages Are Copied to the Deleted Items Folder

Check this check box to move deleted messages to a Deleted Items folder. Depending on how Cisco Unity is set up, subscribers can access the Deleted Items folder by using Outlook, the Cisco Unity Inbox, or the Cisco Unity phone conversation.

The hard disk on the server where messages are stored can quickly run out of space when deleted messages are saved. To prevent this from happening, you can use the Message Store Manager utility, available in Tools Depot, to automatically purge messages according to a schedule you specify. See the Message Store Manager utility Help for details.

Voice Messaging subscribers can do the following tasks when this check box is checked:

Use the phone and the Cisco Unity Inbox (as applicable) to permanently delete messages stored in their Deleted Items folder.

Use the phone and the Cisco Unity Inbox to listen to, reply to, or forward messages in their Deleted Items folder, or to restore them to the Inbox.

Unified Messaging subscribers can do the following tasks when this check box is checked and when subscribers have their Outlook Inboxes set up to move deleted messages to the Deleted Items folder:

Use the phone, Outlook, and the Cisco Unity Inbox (as applicable) to permanently delete messages stored in their Deleted Items folders.

Use the phone, Outlook, and the Cisco Unity Inbox to listen to, reply to, or forward messages in their Deleted Items folder, or to restore them to the respective Inbox.

See the Advanced Settings tool in Tools Depot to specify that the Cisco Unity conversation request confirmation from subscribers before proceeding with a deletion of a single deleted, new, or saved message, and to change how the conversation handles the deletion of multiple deleted messages.

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