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Once downloaded (a tiny 729kb that can be acquired either via downloading through your mobile browser, directly to your PC, via email or via SMS), iSkootForSkype.CAB needs to be copied to your Windows Mobile device, either via Windows Explorer or ActiveSync. Once done simply select to install.
After installation, run iSkoot and either sign in there and then, or you can signup for a Skype account through your phone. Users familiar with the Skype desktop client will notice visual similarities - in particular the interface allows you to simply and easily choose your contact and call them with the minimum of fuss.