Exchange 2010 editions

Exchange 2010 is available in three editions. The standard edition is the most common, as it contains all of the necessary functionality required by an email server. It is limited to five databases (including a public folder database if deployed). If you attempt to mount a sixth database, Exchange 2010 Standard Edition will gracefully refuse and issue event 9591: Exceeded the max numbers of 5 MDBs on this server. You also have to operate under the same restriction if you install a trial version of Exchange 2010. The standard version of Exchange 2010 supports the new Database Availability Group (DAG) high availability feature. Microsoft made the decision to include DAG support in Exchange 2010 standard edition very late in ...

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