Skype does not work the same way on the Nokia N800 as under WinXP.

When I ring a contact and they send a chat message I can see the message but I can not switch to the chat window and enter text in reply. I have to disconnect the call make a response and then close chat to get back to making a call again.

The contact screen hides the chat button when a call is made. If you are in chat and get rung back (same person calling as you are chatting to) you can't get to the accept call window.

As chat and voice work from the sender okay I see no reason why the N800 can't work like a PC.

Gerald