Upgrade to Mountain Lion but get told my mac is not compatible

I have a mac pro which i want to update to Mountain Lion but get told my mac is not compatible. The Mac pro is Standard Configuration (MA356LL/A) with Two 2.66GHz Dual-Core Intel Xeon processors. Why is it I keep getting this message?
and does that mean my mac has reached the end of it's upgradeability?

I have:
  Model Name:
Mac Pro
  Model Identifier:
MacPro1,1
  Processor Name:
Dual-Core Intel Xeon
  Processor Speed:
2.66 GHz
  Number of Processors:
2
  Total Number of Cores:
4
  L2 Cache (per Processor):
4 MB
  Memory:
11 GB

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