I know that Snow Leopard and older machines do not support iCloud etc. but have been happily using a work around provided by GarryRobson (many thanks) posted on October 18th 2011. This involved setting up a CalDav account on the desktop using server address p06-caldav.icloud.com.
To date all had worked well both on newer machine and iPad as well as older iMac (running OS 10.6.8). However, I am now seeing an error message:
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