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Can anyone provide any basics in terms of office/exchange365 &quot;hybrid&quot; approach. Does it mean half your mailboxes are in the cloud and half are hosted on an exchange server in your environment? If so why do people go for a hybrid approach, and not all in the cloud, or all on local servers? <br />
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Also if migrating to exchange365 cloud mailboxes, do you as a client have any control over mailbox/security policies etc, if so what kinds of configurations will MS discuss with you for your 365 deployment?
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Can anyone provide any basics in terms of office/exchange365 "hybrid" approach. Does it mean half your mailboxes are in the cloud and half are hosted on an exchange server in your environment? If so why do people go for a hybrid approach, and not all in the cloud, or all on local servers? 

Also if migrating to exchange365 cloud mailboxes, do you as a client have any control over mailbox/security policies etc, if so what kinds of configurations will MS discuss with you for your 365 deployment?

hybrid exchange365

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.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.