Tip - Internet Explorer 11 only loads OWA Light - MSOutlook.info

I've just installed Windows 8.1 which includes Internet Explorer 11. Apparently, I'm now a bit too up-to-date for my company, which is still running Exchange 2007. When I go to the OWA website, I'm only being offered the OWA Light version and no longer the full feature Premium version; The option to use OWA Light is selected and cannot be disabled. Can I still access the Premium version somehow or does this require my company to install an Exchange update or even upgrade to a newer version?
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