Courses

Below are recommended (online) courses when want to learn about, prepare for exams related to, or are generally interested in Exchange, Office 365, or related technologies like PowerShell.

Regarding online training I would highly recommend subscribing to PluralSight, as they provide training material that follows trend, with contents presented by field experts such as Microsoft MVPs. PluralSight offers applications to consume course material on desktop or mobile platforms, including offline playing capabilities which is great when traveling.

Exchange On-Premises

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Migrating to Exchange Server 2016
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Exchange Server 2016 Recipient Administration
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Managing Mailboxes and Distribution Groups in PowerShell
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Setting up an Office 365 Hybrid Environment

Exam 70-345: Designing and Deploying Exchange 2016

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Hybrid & Migrations
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Transport
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Compliance & Archiving
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Mailbox Databases
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Client Access
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Recipients & Security

Exam 70-346: Managing Office 365 Identities and Requirements

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Setting Up Office 365 Identities
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Supporting Office 365 Identities
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Administrating Office 365 Identities

Exam 70-347: Enabling Office 365 Services

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MCSA and the 70-347 Exam
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Plan/Configure Skype for Business Online
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Exchange Online (End User and Planning)
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SharePoint Online Site Collections
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Manage Clients and End-user Devices

Office 365 Misc.

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Office 365: Deploying & Updating Microsoft Office 365 ProPlus
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Office 365 Exchange Online Administration
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PowerShell for Office 365