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In this post, I’ll explain how to fix the pesky Calendar can’t save event X to Exchange Server issue with Apple’s Calendar in OS X or macOS. The issue occurs when the Mac Calendar won’t sync with Exchange and then refuses to accept the calendar data on the server.
Calendar and Exchange
Apple’s Calendar (prev. iCal) in OS X/macOS and Microsoft Exchange do not always play together nicely. At work, we have a bunch of Mac users who had issues with our on-premise Exchange 2010. When we migrated to Office 365 the situation improved dramatically, but I still ran into the occasional problem.
One of the more annoying problems is when Calendar doesn’t allow you to make changes to an event or even delete it. But instead, it responds with the following error message: “Calendar can’t save event X to Exchange Server.“
The Calendar app often gives you three options: Revert to Server, Try Again and Ignore. In some cases, neither option resolves the issue, and the error message keeps coming back,&nb