Removing then re-adding your corporate email account (Exchange ActiveSync) often fixes login and not receiving email issues.
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From a Home screen, tap the Apps icon
.
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From the Apps tab, tap Settings.
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Tap Accounts.
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Tap Microsoft Exchange.
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Tap the appropriate email address.
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Tap Menu
(located in the upper-right).
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Tap Remove account.
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From the "Remove account" prompt, tap OK.
Related Topic: Set Up Corporate Email