Litigaion hold in exchane 2010

I need to know when users mailbox in exchange 2010 placed in litigation hold then users emails are still be deleted or will remain as it is. Appreciate if you please provide me any appropriate link where I can find the more details, cause I require to know when litigation hold is configured for a mailbox/users then afterwards what happens to those messages, are they being deleted after certain period or keep those emails forever. Appreciate any appropriate link would be very helpful.
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The mailbox 's content which on litigation will not able to delete until litigation is off.

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