![]() InitializeExchangeOnlineRemoteSession : Unable to create a remote shell session to Exchange Online. Creating an Exchange Online remote session. ![]() When entering the global admin credentials, it fails with an ‘access denied’ error: When starting the script, it wants to setup a Remote PowerShell connection to Exchange Online, and the following screenshot says it all: this is a basic authentication login prompt: Then the mail-enabled folders must be synchronized to Azure AD using the Sync-ModernMailPublicFolders.ps1 script that you can download from the Microsoft download site. The first step is to synchronize the Public Folder mailboxes from Exchange 2016 to Exchange Online using Azure AD Connect. When mailboxes are in Exchange Online, they must use Public Folders in Exchange 2016. ![]() You must move Public Folders from Exchange 2016 to Exchange Online when all mailboxes are in Exchange Online, and before doing that you must use Public Folders cross-premises. Public Folders is a bit different, but luckily Public Folders in Exchange 2016 are ‘Modern Public Folders’ and as such similar to Public Folders in Exchange Online. Moving mailboxes from Exchange 2016 to Exchange Online is not that difficult, that is when you have all the prerequisites in place of course.
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