I've read some threads on this problematique, but I didn't find any issue.
My users use OUtlook 2007 with ZCO 188.8.131.5231.
Since they use ZCO, they are not able to put reminders in shared calendars. Still the same error : "The reminder for ... will not show because it is in a folder that doesn't support reminders".
If I validate the item, reminder will appear only in webmail...
So is it possible to set reminders in shared calendars or not?