How can I revert back to Mavericks?

I use my MacBook Air for work. After upgrading to Yosemite, I cannot receive email from my company's Exchanger server (I can send email from it.. and my iCloud email seems ok). I've tried disabling/enabling the account, I've tried setting it offline, then online. I've tried restarting the mac. I've tried closing and re-launching mail. I've even tried setting up a new account. And I've tried combination of these. Nothing works! I cannot wait for Apple to fix the problem.
Is there anyway to revert my MacBook to Mavericks? How to do it?
I backup my Mac on Time Machine just before I upgraded. If I restore the latest backup, will the OS be restored to Mavericks too?

OS X Yosemite/ OS X Mavericks: Revert to a previous OS X version

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