Primary is the master of the hierarchy it does not pull from anywhere elseĪt least once every 15 minutes as long as there are client connections to the mailboxĪll secondary mailboxes are synced once daily.Īdditionally, the following situations also trigger sync operations between a secondary mailbox and primary: This workflow is executed with the following frequencies: Mailbox Type The frequency of connection depends on whether clients were connected to the mailbox or not. This process is accomplished with the help of the ServiceHost process (running on each server) and the MRS proxy service (running on the server hosting the primary mailbox). At regular interval, the secondary hierarchy mailbox connects to the primary hierarchy mailbox to pull the changes in hierarchy. ![]() In pull mode, hierarchy replication is driven by secondary hierarchy mailboxes. Let’s discuss how the public folder synchronization works and the components involved. EPF2 won’t show the complete public folder structure until the hierarchy is synced: Public folder mailbox EPF1 is the primary hierarchy mailbox and has two folders in the hierarchy. ![]() Here’s what can happen when the hierarchy is not in sync. The hierarchy is synchronized across all public folder mailboxes, to ensure a single PF mailbox is not burdened with serving the hierarchy to all clients.įrequent synchronization of the hierarchy is critical to ensure end users always get an up to date view of the hierarchy. The hierarchy makes it possible for clients to determine which PF mailbox stores the actual content of the public folder. In simple terms, the public folder hierarchy is the skeleton or logical structure in which the permissions and other properties of public folders are arranged. The process in which only changes made in hierarchy, after last sync, are synchronized to secondary hierarchy PF mailboxes. Note that this is a hierarchy only synchronization. The process of synchronizing entire hierarchy to secondary public folder mailboxes. In modern public folders, there is only one copy of content.Īny public folder mailbox that is enabled to serve the hierarchy information to clients is referred as a hierarchy mailbox. The public folder mailbox storing the actual content of a public folder. The hierarchy replication is always from primary hierarchy public folder mailbox (which contains the only writeable copy of the hierarchy) to secondary hierarchy mailboxes. The process of copying the public folder hierarchy between public folder mailboxes. Secondary hierarchy public folder mailboxĪll other public folder mailboxes in an Exchange organization, except the primary hierarchy, which store read-only copy of the public folder hierarchy. There is currently no supported way to transfer this functionality to another mailbox. The first public folder mailbox created in an Exchange Organization is the primary hierarchy mailbox. ![]() The public folder mailbox that hosts writable copy of the public folder hierarchy. The actual data stored within public folders. ![]() The logical structure/skeleton of public folders and associated properties as well as permissions.Ī special type of mailbox that is used to store public folder content and public folder hierarchy for modern public folders. In this architecture, public folders are stored in specialized mailboxes, called public folder mailboxes. Public folder architecture and deployment in Exchange Online and Exchange on-premises versions newer than Exchange Server 2013. The information presented here applies to public folder deployment in Exchange on-premises as well as Exchange Online, with any differences called out.īefore we get started, these are some of the terms used in public folder world: Term The purpose of this article is to provide high level overview of hierarchy synchronization process in public folders and provide some troubleshooting steps to monitor and troubleshoot hierarchy related issues.
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