when attempting to create a meeting or appointment in the public calendar, it won't allow me to add a recipient (TO:). I get the error message:

"this meeting invitation cannot be sent because it is in a public folder" in Outlook 2011"
The "folder" option on the "new" icon is grey and unusable. 
All other options ( e-mail, meeting etc ) are ok and the folder option is fine in calendar, contacts etc
Like in the microsoft office for PC, when you receive a meeting request with a time that you are busy, in outlook pc you have the option to propose a different time when you reply to the sender and with Outlook mac 2011 up to date I can't find it.

Best regards,
When I was an Outlook on PC user, I frequently received meeting requests, then accepted them and then used that same meeting in my calendar to invite additional staff members I need to support that meeting.  Is this possible in Outlook for MAC 2011?