I have been asked to facilitate the sharing of a client's Outlook calendar with a couple of their work colleagues. There is no Exchange server involved but two of the people have Office 365 and are suggesting that the third (who has Office 2010) should also have Office 365 in order to more easily facilitate the sharing.
Everything I have read so far suggests that even with Office 365, full calendar sharing is not possible without an Exchange server and the Outlook Web App. I am wondering if anyone here can throw some light on this and suggest the best way to set this up, if at all possible, without Exchange. I am thinking that it may be possible via Outlook.com but still not sure. Any help would be gratefully received.