I understand that private is an Exchange concept, but I was hoping Apple would have implemented this feature since they are making use of ActiveSync. If the option is available it is certainly not obvious from the calendar creation screen. A bit of cursory searching turned up this whiny Apple forum thread, but alas no solution.
On the iPhone is it possible to create calendar appointments that are marked as private?
Best Answer
No you can not.
I assume you're using Exchange for you calendar, although you didn't specifically say so.
You can't necessarily create a private event, but you can create a subcalendar in Exchange that you can control the permissions of so that only you can see it. You can do this by:
Open Outlook
Go to Calendars
Right click on your current main calendar and click New Calendar...
Create the new calendar under your Exchange account's Calendar section
Right click on your new calendar and select Properties.
Go to the Permissions tab.
Make sure the "Default" user is set to None.
Set your own permissions to "Owner" and remove any other users from the list.
This calendar should show up on your iPhone fairly quickly. If it doesn't, try disabling Calendar syncing in Settings → Mail, Contacts, Calendars → Exchange.