OK, done. I will see if it helps. In the meanwhile, I noticed that some (but not all) of my Reminders are visible in Outlook, but all but one show as single-date events (they are all recurring). Also, the Reminder color changed from blue to lavender.
Outlook, the app or Outlook.com? Also, on your iOS device, go to Settings - Reminders - Sync and change it to "All Reminders", if it's not already selected.