I understand that OWA only gives access to Calendars in your mailbox.

Because I would like to access my Calendar from home sometimes using OWA, I
have created and started using a Calendar within my mailbox. this works fine
but I have two issues:

1.   When appointments are created by people at work, they seem to be
created in my original Calendar (under Personal Folders).

2.   There is another (third) folder (under my Mailbox) that seems to be a
duplicate of the one under Personal Folders, but I'm not able to delete it.
The delete option is not enabled for it.

I would really like to only use and manage one calendar at work and at home
(via OWA). Is this possible?