Calendar sharing with Office 365

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 but still not sure. Any help would be gratefully received.
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Go to the user's,switch to the calendar, there you should have an option to share with the user's  wanted.

The other users then need to bring in the shared calendar.

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grigorovskyAuthor Commented:
Thanks Arnold. Are you saying that this would allow full sharing and updating of the calendar using Office 365 alone and no exchange server?
Offic365 includes exchange that is hosted and handles messaging.
Have not had all possible exposure, but email/exchange is part of what is included in o365.
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grigorovskyAuthor Commented:
I have this from

"When you want to share your data with others, then the other person must also be on Office 365 for Business. In addition, this person must also be part of the same Exchange Organization (read: a license within the same subscription account). Both having an Exchange Online subscription of your own will not be enough and won’t allow you to share folders."

So according to that it is not as straight forward as I would have hoped. How do we get the others to be part of the same subscription account and why has Microsoft made it so tricky?
That is correct, you said you have a person who needs to share their calendar with their work colleague.
When sharing the calendar, the work colleague with whom it is to be shared has to be searchable/discoverable.

It would be the same if you have two people one works for company A and the other for company B.
not sure an employee at company A can share their calendar with the employee at company B.
grigorovskyAuthor Commented:
They are work colleagues but not under the same company umbrella. The two who already have Office 360 have separate licences and the third (who is wanting to share their calendar) is looking to upgrade but what is the point if they can't share? Really don't understand why not! Do we have to resort to a third party solution such as "CodeTwo Public Folders" or can we somehow join the subscriptions together?
grigorovskyAuthor Commented:
Alternatively should we create a new IMAP or account and then share credentials?
create where? I do not know whether you can share a calendar across platforms. is the individual, perhaps you would be permitted to share with another user account holder, but have not tried it so can not say.

you of course can try. it might be that you would have to get the paid account to have that functionality.
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