I think that published calendars are read-only and cannot be modifed by
anyone else, no matter their permissions.

--
Milly Staples [MVP - Outlook]

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After furious head scratching, BobMac asked:

| "Nikki" wrote:
|
|| It is possible:
||
| I have shared my calendar by publishing to Office Online. However, I
| would like to give my co-worker permission to _add_ to the calendar.
| Is this possible? Are there any free alternatives. We don't have the
| money for either Exchange or one of the third party solutions