I have tested this thoroughly as I am having the same problem. It went away when I dropped an Android-sync'd device. Not as clear as it sounds, the problem is how CRM-created activities sync due dates with Outlook and how that carries through to OWA and therefore, mobile devices that sync to OWA data. Here is more detail: I no longer have the �missing date� issue. This is what I know so far: 1. If I create an activity in CRM, it automatically creates an activity in Outlook with a reminder. 2. OWA shows the new activity but no due date. It does have the �reminder� date however. 3. If I clear the reminder, it clears in both Outlook and OWA �at this point, Outlook has the start and end date set but OWA has none of those. 4. If I create the activity in Outlook and track in CRM, it shows in OWA and CRM. There is only a due date in Outlook & OWA (no start date), and no automatic reminder. CRM reflects both a start & due date. This is problematic as every CRM-created activity has no due dates in OWA. OWA is what mobile devices sync to so this makes my Windows Phone a poor tool unless I go to OWA and match the due date of activities created in CRM with the Outlook/CRM data (this is what I�m doing daily now). I believe this was the basis for the missing dates. I was using an Android-based sync tool for activities on my Lenovo tablet. It would sync with OWA-based data (which has no due dates for CRM-created tasks), then in some way, the activity was pushed back to OWA with no due date and that was transitioned through the Outlook connector and back to CRM with no due dates. It was a train wreck. I sync with no 3rd party devices now (I can�t without disaster) with the exception of my Windows Phone which will show no due dates on CRM-created tasks unless I manually create them in OWA. Please fix.