I have been using SkyDrive groups for a long time now and have made use of its Group calendar options. However, I recently created a group for a project of mine and found that all the Group calendar options have now disappeared. I would like to know what is happening and if there is a way to fix it.

Thanks in advance.
I'm confused on two counts.

Firstly, is there a difference between Group Calendar and Shared Calendar?  I have seen both terms used in my research but am not sure if they really mean the same thing.....?

And secondly, all I want is to be able to sure and view Calendars with my colleagues (of which there are only 3) in Outlook 2011 for Mac.
I've just looked at Exchange Online, Exchange Server and then Office 365 but it I'm not clear about the following:

Do I have to buy Microsoft Exchange AND Office 365 or is Exchange included in 365???

Or is there any other solution for my very simple needs?

Any help much appreciated but this novice who is trying to learn fast!