Turn off the sound for new Windows Mail messages
Windows Mail lets you know when a new e‑mail message arrives in your Inbox by playing a short sound. If you don't want the sound to play when new messages arrive, you can turn it off.
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Open Windows Mail by clicking the Start button
, clicking All Programs, and then clicking Windows Mail.
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Click the Tools menu, and then click Options.
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Click the General tab, and then clear the Play sound when new messages arrive check box.