Exchange 2010 and maximum databases per server
Exchange Server 2010 Standard Edition allows a maximum of 5 databases per Mailbox server. Exchange Server 2010 Enterprise Edition allows a maximum of 100 databases server. That is a *maximum* number of databases including all active and passive databases. So, Standard Edition *can* be a member of a database availability group, but it can have no more than 5 total database (the active and passive databases combined.)
Labels: Exchange 2010