The custom dictionary can be edited:
Windows Mail Spell Checker Dictionary
Windows Mail does not have a British (UK) dictionary.
If you upgrade to Windows Live Mail, it has an easy fix to add UK spell checking.
http://get.live.com/wlmail/overview
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Gary VanderMolen, MS-MVP (Mail)
"Iain Andrew Donald McIntyre" <Iain Andrew Donald McIntyre@xxxxxx> wrote in message
news:B10532BA-81CB-4215-A4F5-F8F82C014B7D@xxxxxx
Quote:
> 1. How do I edit the custom dictionary in Windows Mail? I misspelt
> "neighbour" as "nieghbour" and cannot undo it.
> 2. Is there a BRITISH spell checker for the app? It is becoming very
> tedious to have to add words like "favourite", "neighbour", "realise", and
> "colour" to the AMERICAN one...