Applied regular decision and deferred?

<p>Hi everyone,
I applied to UMich regular decision, and submitted my application in late December. In early February, I got an email that my application has been deferred because they have been unable to review it- for those of you wondering, it was the first type of letter. Does anyone know what this means? I called and they told me I would hear by mid-April, but I'm just confused because I didn't early action and the email implied my application was never even reviewed.
Thanks!</p>

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