How to add follow up folder to favorites in Outlook 2007

In Outlook 2007, 2010 -- please click the File > New > Search Folder.

1. It is also available to click the Search Folder > New Search Folder in the Navigation Pane. ...
2.  Step 3: In the New Search Folder dialog box, select and highlight the Mail flagged for follow up item in the Select a search Folder: box.
3. Step 4: Click OK button.