VSTO, C#, OL2007

I need to refresh a search folder on Outlook Open since the DASL criteria
has a %Today function which works OK on the day the item first appears in
the folder but doesn't work the following day when I open up Outlook.

I have just changed the folder's refresh rate to 5 minutes but this still
means the user may get the wrong results when they first open Outlook in the
morning -- unless they presumably wait 5 minutes.

I saw that the folder object has a Refresh rate property but could find a
Refresh method to call.