The MS-201 Implementing a Hybrid and Secure Messaging Platform certification exam tests abilities of messaging administrators to plan and implement a hybrid configuration, manage migration, secure the messaging environment, and manage organizational settings. In this 20-video course, learners prepare for that exam by exploring public folders in Exchange Server 2019, including how to create and manage them, and how to migrate public folders to Office 365 in Exchange Online. Begin by examining public folders in an Exchange organization, including migration scenarios, quotas, and how to create public folder mailboxes. Next, study differences between public folders and Office 365 groups, and examine public folder architecture in both Office 365 and Exchange Online. Learners then explore what to consider before moving public folder mailboxes to Exchange Online, and demonstrate how to use the Exchange administrative center (EAC) to create a public folder. Finally, explore permissions required to implement an in-place hold, and use the EAC to configure a query-based hold, copy search results to a discovery mailbox, and remove an in-place hold.