Lets get back to keeping ETH talk here, and ETC talk in the ETC thread.
There is 3 ETH now:
ETH pre-fork (it is history now)
ETH fork (pro-forkers choice)
ETH non-forked (identical to ETH pre-fork and direct successor)
This is why exchanges have to maintain different wallets and keep track of the 3 eth-tokens!
Only the original ethereum blockchain (ETC or ethereum classic) and the ethereum fork blockchain (ETH).
If you didn't upgrade the client than you are still on the 'original old' blockchain, which is ETC aka ethereum classic.