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I'm planning to adopt Exchange 2016 On-Premise. I have just 20 users with one mailbox per user. I've seen that the only difference between Standard and Enterprise (server) is that while Standard supports 1-5 mailbox database, Enteprise supports 5-100 mailbox databases. <br />
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However, the question is: How many mailboxes will be able to create on each mailbox database?
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I'm planning to adopt Exchange 2016 On-Premise. I have just 20 users with one mailbox per user. I've seen that the only difference between Standard and Enterprise (server) is that while Standard supports 1-5 mailbox database, Enteprise supports 5-100 mailbox databases. 

However, the question is: How many mailboxes will be able to create on each mailbox database?

Choose right Exchange Edition (based on the number of mailboxes)

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.