Do you have the update from MS to fix the daylight savings time change? http://support.microsoft.com/gp/cp_dst#tab2
Make sure all Windows updates and service packs to office are installed.
And what do you mean they fall in a tomorrow folder, does this person have rules setup with folders? There is no "tomorrow folder" in Outlook, it must have been setup manually. Check the rules to make sure there is no type or bug in it.