No airdrop after upgrading to lion

I have a 2.66GHz Intel Core 2 Duo (20 inch early 2008) iMac, ugraded to 4 Gb of memory.
I upgraded to Lion which seems to be operating fine, except that Airdrop does not appear in my Finder window. Do I have to do something to turn it on?
I also have a 2.4 GHz (13 inch late 2008) Macbook running 2 Gb of memory, also upgraded to Lion, which shows Airdrop in the Finder window without having to change anything.
Is my iMac too old to run all of Lion's features?
Thanks for any advice!
Sandy

AirDrop is not supported on all Macs. Only on the newer models. Apparently the older models do not have the needed hardware to support AirDrop.

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The disk is the internal Time Capsule Disk. It's a 1Tb model.
My iMac is localized in Italian
So I write here the Italian message and a possible translation
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