Calender in Outlook today vs Calender in personal folder

Hi,

I have an outlook today service towards the companies exchange server and a
personal folder where I store all the email (due to limits in network
storage of emails).

Before yesterday, when accepting a meeting, the meeting has been moved into
the calender in my outlook today folder. However, starting yesterday, when
accepting meetings they are moved into the calender which exists under the
personal folder...

I have never used the calender in the personal folder (I have not even
noticed if there was a calender before). I would like to remove the calender
in the personal folder OR disable it somehow, but I do not know how...
Right clicking the calender and deleting it is not possible since that
option is dimmed out. I have made sure that the calender is empty so that is
not the problem... It is not possible to rename it either...

Any ideas?

Regards,
Tobbe G