If you have time, give it a go.
You may have other issues though.
I think XP won't boot because it will recognise it is on a different machine. I think it looks for the serial number of the processor.
There will also be issues in getting drivers for the new laptop's components for the old Windows.
One thing I didn't try doing was to load Outlook Express from the old discs onto the new Windows. I don't know if it can be done but it might be worth a try.
A while ago, when fixing my sisters machine, I replaced the motherboard. XP wouldn't boot and told me to ring a Microsoft number. I rang it and the Microsoft representative told me I was pirating their software. I gave her a serve and told her I've had enough with this virus prone Microsoft **** and I was going to wipe it and install Fedora.
She said she was going to give me another three activations.
I told her they were to give me as many activations as their software requests.
I've not had that problem with that computer since.

