How do I stop *wanted* email from going to my Junk folder

There are two important steps you should take:

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When you find email
in your junk mail that is not junk, right click on it's line in the list, select Junk E-mail, and Mark as Not Junk. You'll then have the opportunity to add the sender or the address they sent to to a "safe" list so that they'll not be marked as junk in the future.
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Visit Office Update regularly. One of the things they update is the junk mail filter, and I've seen it improve in accuracy over time.