We use a Public Folder for our office so people can advertise local events and similar information and have a mixed office (OSX & Windows 7)

I found out how to subscribe to the folder in Outlook 2011, however I can't figure out how to post to the group. In the Windows version of Outlook, the New Email button turns into a New Post button when the Public folder is open, the same does not happen on the Mac, and I cannot find anyplace where it has the option to post.

Any ideas?