Customers who have subscribe MS Office 365, can Lifesize could integrate with it?
Yes, Skype for business online is supported. Here is the link for federating to Lifesize Cloud from O365.
Skype for Business Online federation
Just to add to what kpinkham has mentioned above, Lifesize Cloud Premium and Enterprise customers can also have the ability to integrate their Exchange Online (O365) mailboxes with their Lifesize Icon systems, in order to display the calendar of scheduled events in their meeting rooms.
You can see a video of this working here: Lifesize Calendar Integration Overview
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