Finding a free Proper English Checker is near impossible. All appear to be US interpretation of English. They should call these Americanese, not English.
I feel that having to DL this sort of thing for WinXP is mindless, regardless of language..
MSoft is going backwards with common necessary support of this nature in favour of the worst and most painful resource hogging OS system ever forced on us, VISTA.
Extra Dictionaries and Thesaurus's should not be needed with software that costs way too much anyway.
Outlook Express is easier to use and less annoying than Outlook but support is rapidly dieing for OE.
Swith to Outlook as it uses the customisable MS Word dictionaries, or, get one of the zillion other email programs that have stand-alone customisable spellchecker and thesaurus included with them.