@AlanM56 I thought option 3 was going to be the fix too, but as it turns out the event/appointment that one sends by email can only appear on the calendar of the same account.
One of the better features of Outlook, and my reason for using it, was its ability to manage multiple email accounts, multiple contact lists, with multiple calendars. I have 2 exchange accounts and really would like to be able to see a consolidated calendar synced with my iPhone. Used to be that we could synch with itunes (at least we could one way). But that was before Maverick. Some may recall that the sync services would create duplicate entries of calendar events and really make for a messy calendar.
So now I have an exchange account that is keeping my contacts tidy, but the calendar sync is still a dissapointment. I, like many, am an independent contractor that maintains several email addresses--one for each of the businesses that I service. I also have to make appointments for these various businesses.. each with its own email server. It would be so nice to have a flexible program that could consolidate those appointments and synch them with my phone.