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opened mail disappears and cannot be found - does not go to trash - How do I fix

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several opened e-mails left in my in box for future reference have disappeared. They are not in the trash.

several opened e-mails left in my in box for future reference have disappeared. They are not in the trash.

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Click the 3 bar menu button Select View-Messages and make sure All is checked. Sounds like you have Unread active.