Exchange 2007 and Office 365

Hi,

I am currently migrating my mailboxes from Exchange 2007 on premise to Office 365.  

I have moved over 1 mailbox for testing purposes and have managed to get my local Outlook 2010 to connect to this cloud mailbox. 

The issue I am having is being able to share the calendar between the on premise and office 365 and vice versa.

I can setup a meeting request before the two from OWA but I just cannot access the calendar.

Also I cannot add the office 365 mailbox to my Outlook 2010, i get an error 'the name cannot be resolved'

Any help?

Thanks in advance

Z