Not that we got a lot of answers from the folks at Mirapoint, but based on the open sources we could read (something called Mirapoint Administration Protocol Reference), we think it goes like this:
- Export your MM database t0 a DAT file and ship it to us for conversion
- We convert it and give it to you with our tool zinsert that produces iCalendar format files
- Run zinsert to convert all your MM data into ICS files for each user
- Use the Mirapoint Calendar UPSYNC Subcommand to load the ICS data into each individual calendar file.