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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.
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1/. The sizing all depends on your user base. How many emails they send and receive a day, the average size of those email and the size of their mailboxes. Microsoft has a sizing calculator I would recommend. Otherwise I am just guessing for you.
http://blogs.technet.com/b/exchange/archive/2013/05/14/released-exchange-2013-server-role-requirements-calculator.aspx
2/. The best redundancy would be four servers. Two servers acting as a CASARRAY and two servers acting as a DAG for mailbox redundancy.
3/. Software licenses depends on what you are going to accomplish. There are Standard and Enterprise Exchange Server licenses. The only difference here is the number of database you need and for 200 users I would say Exchange Server Standard is the way to go. There are also Standard and Enterprise USER CALs dependent on the features you need. If you need archiving for example, or, unified messaging. Standard CALs most functions. You world need 200 USER CALs and an Exchange Server Licenses depending on how many servers you go with, and any base OS server licenses.
4/. Are you referring to the Active Directory Connector? Shouldn't need this.
5/. I use Symantec Backup Exec 2012. R2 will be releasing soon and that will include granular recovery again.