Ligthning does not display invitees available time frame

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Newsgroups gmane.comp.mozilla.devel.calendar
Message-ID <[email protected]> 
Hi guys! First of all, sorry if this isn't a topic related to this group, but I'm a little lost.

The issue that I wan't to know if has a solution is the following.

Each time I create an event and I add someone, next to the name, it's suppose to appear tha available time slot for that particular person....but nothing appears.

It's something that I need to configure? Something from my work Exchange server? Or something else?

I'm currently using Ubuntu 12.04 - TB 15.0 - Addons: Lightning 1.7 - Exchange 2007/2010 v1.8.5

Any help will be appreciated!
Thanks in advance
Pablo
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