Licensing change for Multi-Mailbox Search

As per the new norms from Microsoft, you do not require an Enterprise CAL to use the Multi-Mailbox Serach Feature in Exchange 2010

Read More: http://blogs.technet.com/b/exchange/archive/2012/07/13/announcing-a-licensing-change-for-multi-mailbox-search.aspx

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Email Archiving and Retention

http://www.microsoft.com/exchange/en-us/email-archiving-and-retention.aspx