Microsoft Office Tutorials and References
In Depth Information
Exchange Online implementation options
EHE uses a technology known as Identity-Based Encryption (IBE). IBE uses recipients' email
addresses as the public keys. When a message is redirected to EHE by FOPE, it stores the
message and encrypts it with a private key, which will be made available to the recipient. At
the same time, EHE notifies the recipient of the email and initiates a two-step, email-based
verification process. Once a recipient's identity has been verified, the recipient can access
the email through a clientless, browser-based reader, known as the Voltage Zero Download
Messenger, over an HTTPS connection.
Exchange Online implementation options
Exchange Online is the most flexible service in Office 365. There are many ways in which
you can implement Exchange Online. In fact, whenever the hybrid nature of Office 365 is
mentioned, Exchange Online is the foremost that comes to mind.
To describe the flexible nature of Exchange Online, let us recall the core Exchange
workloads we just defined:
Primary mailboxes
Email filtering and handling with FOPE
Email archiving with EOA
As the name implies, a hybrid implementation of Exchange is a combination of online and
on-premises Exchange workloads. In a hybrid environment, the above workloads can be
handled by on-premises infrastructure or Exchange Online in any combination. In this
section, we review the different hybrid Exchange models. In Chapter 11, we cover the
configuration and deployment details for these models.
Hybrid mailboxes
The hybrid mailbox model is the most commonly recognized configuration and is also the
most complex of all the hybrid models. In this model, Exchange Online is deployed in such
a way that the organization has some mailboxes on premises, while other mailboxes reside
in Exchange Online. However, despite the disparate placement of mailboxes, the
organization continues to retain its singular look and feel, and users are completely unaffected. This
means that the organization and its users continue to have a single global address list (GAL)
and the ability to share calendars and view free and busy times, regardless of where the
mailboxes reside. The entire organization will also share the same SMTP namespace.
There are many reasons for an organization to set up a hybrid mailbox configuration, and it
is quite a common occurrence. For example, if an organization already has an on-premises
Exchange implementation and wants to migrate to Exchange Online over time, a hybrid
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