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Have you ever seen warning like the one shown here?

It may have made you wonder if someone was sending you forged email. You should always be on your guard, but there can also be an innocent explanation.

First, remember that every message has a complex set of headers...Read more

You can grant others permission to see your calendar. You choose the level of detail (when you're free or busy, the subject of the event, or the details of the event). You also have the option of marking a calendar item as Private; this removes all privileges except seeing that you are busy for...Read more

This information is intended for technical support providers. End-users should contact their technical support for assistance. Open System Preferences , then select Security & Privacy . Click the ...Read more