Thanks. The reason I haven't upgraded long before this is that my old and no longer maintained, but much-loved, email application will not run under 64-bit Windows. I've been putting off the day when I'll have to switch to a new email app, which will involve (a) having to familiarise myself with it and (b) transferring all my saved email across to it - possible but not to be undertaken lightly. When I do finally bit the bullet, I'll go for a more powerful PC, as I'm lucky enough to be able to afford it.