As far as I know, only IE is outdated enough not to include spell checking (imagine that). As such, it makes no sense to have two different dictionaries (one for phpBB, one for the browser) trying to spell check the words, as well as the added server load required to constantly check each word. Maybe this would have been a good idea before browsers started to include this on their own, but at this point, I don't see the need.
if you absolutely need spell checking and you're stuck with IE, I suggest you switch over to MS Word (or similar), type up your post, and then copy/paste it back into the editor.
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