Limit of 5 calendars open in OWA 2010

Greetings. 

I have recently upgraded our organization to Exchange 2010 SP2 (from 2003).  I now see that there is a limit to the number of calendars that can be viewed through the outlook web app.  Is this limit able to be modified for a subset of users?

I have read through a number of articles talking about new throttling limits in Exchange 2010 and thought maybe the parameter OWAMaxConcurrency could be where the limit is set.  However, I created a new throttling policy and modified just this value up from 5 to 15  using the command below:

New-ThrottlingPolicy 15ConnOWAPolicy -OWAMaxConcurrency 15

I then applied to a single mailbox and still have the same 5 calendar view limit from that account in OWA.

Would someone be able to comment on whether I am on the right path or if this limit has been successfully modifed elsewhere?  I just have a handful of users where this needs to be raised.

Thanks,

Greg