How to sync calender from Snow Leopard to el capitan.
Also how to sync mail boxes Snow Leopard to el capitan.
Mac OS X (10.3.x)
Not with Snow Leopard > System requirements for iCloud - Apple Support
I haven't done this in a couple of years, so it may not work any longer, but you can share Mail, Calendars, and Contacts running Snow Leopard. Based on my experience, I don’t recommend syncing Contacts - created a lot of problems with duplicates. If you have 2 step verification enabled on your Apple ID, you will need to generate an application specific password for Mail, iCal, and Address Book. Apple ID - Manage
Snow Leopard iCloud - Address and iCal
Snow Leopard iCloud - Configuring Mail with Mac OS X v10.6 or iOS 4
how to sync calender from Snow Leopard to el capitan
