Configuring preferences and options in Outlook.com
The spell checker in your screenshot is from your browser's spell check. You need to turn it off also to avoid the checking of the spelling.
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Outlook.com web Editor is disappointing, as it does not support multiple language spell checking (obvious for people working in multinational companies to know and use daily at least one or two foreign languages), it lags (sometimes just stops checking spelling for no aparrent reason) and is really slow.
How to disable Editor completely and revert to browser spellchecking?
Configuring preferences and options in Outlook.com
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The spell checker in your screenshot is from your browser's spell check. You need to turn it off also to avoid the checking of the spelling.