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In classic Outlook, when composing an email message or reply, select the text to cross out.
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Go to the Format Text tab and select
Tip: If you don't see the button, select the ellipsis (...) at the right end of the ribbon, and choose Strikethrough from the list.
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In new Outlook, when composing an email message or reply, select the text to cross out.
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Select the Format text tab on the ribbon, then select
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In Outlook for Mac, when composing an email message or reply, select the text to cross out.
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On the ribbon, select
