Outlook changed default Calendar

Hello,

I currently have the problem that up until 11.12. I had only one "Calendar" under the calendars, now I have the problem that another Calendar was created. Up until the 11th all my colleagues could see my entries, but now all is switched to the other "Calendar".

So now I have 2 Calendars one which my colleagues see (completely empty) and another which only I see with all my entries in it.

I cannot move the entries to the other calendar as all my meetings would again send mails to my colleagues.

So is there a way to change the default calendar which is available to my coworkers?

Please help

Thanks

Paul