Try as I might, I canNOT train MSOffice’s spellcheck in the differences between “affect” and “effect”. Dumbass subliterate M$ programmers seem to refuse to allow “effect” to be used as a verb. Of course, most people can’t discern between the two words, but one might think that fixing a spellchecker’s mistakes would be allowable for a user to effect.
(Yet another reason why I generally prefer OpenOffice/LibreOffice, although I have come to prefer and migrate back to Outlook 2010 from the “open[er/ish]” Thunderbird mail client.)