Please add reminder options to the calendar invites that can be generated using the sync option on date related columns for Outlook.
This will require updating the Sync dialogue to set the reminder, for example:
- At the time of the event
- 5 minutes before
- 15 minutes before
- Custom
In the webcal: feed a VALARM will need to be added but it should be noted that Outlook does not strictly follow the rfs5545 specification.