As the title said, email app cant work. Whenever I click the email app, it shows me a blank sreen.

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I am sure I have added my gmail account into email app. I can read emails before. Now everything disappears and cant add email account, either.

How can I fix this? Reinstall this app? Thank you!

The Metro apps are very incomplete. I would expect them to be much better in the Win 8 RP to be released in early June. This next beta will require a clean install so be ready.