Two Primary calendars?!?!? Outlook 2013

[countersteer]

It appears that I have somehow ended up with two primary calendars in Outlook 2013 through Office 365 on my Windows 8.1 equipped Dell laptop. I'll identify them by color for discussion purposes....

The "green" calendar synchs with OneDrive and my Win 8 phone. In its Calendar Properties, it shows Location: \\r*****@live.com. But, if I try to create a calendar event on my laptop in this calendar, an error message shows up stating "This meeting is not in the Calendar Folder for this account. Responses to this meeting will not be tallied. Do you want to send it anyway? Yes or No. Therefore, I get no responses if I send from this calendar. If I right click on this calendar, the "delete calendar" is greyed out which I understand indicates that this is primary calendar.

The "blue" calendar synchs with nothing that I can tell. In its Calendar Properties, it also shows Location: \\r*****@live.com. I create events on this calendar and it will receive responses from others. Further, if someone sends me an invite to the r***@live.com email address, it will put it in the "blue" calendar. The problem is, as stated before, that this calendar will not synch with OneDrive and, subsequently, my phone. If I right click on this calendar, the "delete calendar" is greyed out which indicates that this too is a primary account.

In the account list, there is a single email account for the r****@live.com account.

On OneDrive, the only calendar that shows up is the "green" calendar.



So how do I get to a single calendar that sends, receives and synchs?

Note that I have been using Outlook for over 10 years, updating as necessary, suffered through the loss of .pst files, etc. etc.

Any help would be appreciated.