Your best option is probably to use Thunderbird. It's from the same source as the Firefox web browser and mirrors Outlook Express quite well:
https://www.mozilla.org/en-US/thunderbird/
I had a feeling someone would tell me that Chris, but I will try Thunderbird, I just liked the way O.E. sent photographs, nice and big instead of these daft little 'attachments' that you have to click on. Thank you for replying -rosy
I've just realised that the link I've given you will give you the US version if you simply click on the green 'Download' button. To get the British version, click on 'Other systems & languages' (underneath the green button), then click the relevant download link next to the 'Windows' symbol.
Before you download Mozilla Thunderbird have a look at Mozilla Seamonkey ( from the same stable ) which I find very much to my liking
http://www.seamonkey-project.org/releases/