In Outlook 2007, it is possible to create rules to file your messages for you as they are received. In order to create a rule to move any messages marked as spam by the Barracuda:

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Expand the list of folders for your IMAP account by clicking the "+" next to your account name.

Create a folder to file the spam into. If you do not already have one, right-click on the account name in the folder list, and select "New Folder".

In the "Create New Folder" dialog, enter the name of the folder you want to create. We'll be using "Spam-Barracuda" for these examples. Next, select the top level of your mail account (likely named with your email address) as the location to create the new folder.

Click OK.

You should now see your "Spam-Barracuda" folder in the list of folders on your account. Now, let's create the rule to file spam into it.

From the "Tools" menu, select "Rules and Alerts..."

In the "Rules and Alerts" window, the "E-mail Rules" tab should be in front, and the "New Rule..." button should be highlighted. Click on "New Rule..."

You will be presented with the Rules Wizard, with a large number of rule templates to choose from. Select "Check messages when they arrive" underneath "Start from a blank rule" and click "Next".

Next you'll be asked to select condition(s) for the rule. Click in the checkbox next to "with specific words in the message header" to select that condition. When the condition shows up in the bottom part of the window, click on "specific words".

A "Search Text" dialog will pop up. In the top part, "Specify a word or phrase to search for in the message header", type "X-Barracuda-Spam-Status: Yes" (without the quotation-marks) and click "Add".

Click OK to dismiss the "Search Text" dialog.

Back in the Rules Wizard, click "Next".

Now you'll be asked what you want to do with the message. Click in the checkbox next to the first action, "move it to the specified folder".

In the bottom part of the window, the action should now appear after the condition. Click on the word "specified" to select the "Spam-Barracuda" folder we created.

Once the folder is selected, click "Finish".

The new rule should show up in the Rules list, and be enabled (the checkbox is checked). Click OK, and now Outlook should automatically file any message marked as spam by the Barracuda into your "Spam-Barracuda" folder.

If you would like to add additional rules to filter out messages with lower Barracuda Spam scores that you still consider spam, see the instructions here.