Nokia Lumia :: Unable To Update 800?

I have been trying to update my Lumia which I haven't updated since I bought it in February this year. When I try to update in the Zune software, a message tells me my phone is up to date.

The current software loaded onto the phone is version 7.10.8107.79 which clearly is an older version. The precise message I get on the Zune software is as follows:

"Your phone is up to date Current phone software version: 7.10 (8107)"

Also, no updates are found when I check for updates on the phone itself.