If you input an email address into a document, then press the spacebar, Word should convert that into an email hyperlink that opens in your email application. If that's not happening, there is probably a fault in your Office installation. You could try repairing it, via Start > Windows Control Panel > Programs > Programs & Features > Microsoft Office (version) > Change > Repair.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]