Hey I am working on this project where an email should be sent 5 days before the CloseDate in an opportunity. This is to be done using workflows only. the ISCHANGED function doesn't work with time dependent workflows and I tried doing the 'CloseDate <> NUll' but it still wasn't firing the email. What should be the criteria in the time dependant workflow actions? 5 Days Before Rule Trigger Date or 5 Days Before CloseDate?