This user's on-premises mailbox hasn't been migrated to Exchange Online
Migrate Exchange 2010, 2013 and newer to Office 365
Mailbox break-ins have residents worried about identity theft | CBC News
Exchange Online - We are preparing a mailbox for the user - Accounts still have an on-premise Mailbox and ExchangeGUID is synced successfully to Office 365 - .matrixpost.net
Fixing mailbox enabled cloud-only user accounts in Office 365 for hybrid migrations | MSB365
Exchange Online - We are preparing a mailbox for the user - Accounts still have an on-premise Mailbox and ExchangeGUID is synced successfully to Office 365 - .matrixpost.net
Streamline Exchange Migrations by using Impersonation
Nine Easy Steps to Simplify Email Delivery Using SimplyCast - SimplyCast
Important: Thunderbird 102.7.0 And Microsoft 365 Enterprise Users
What is a virtual mailbox? And how does virtual mail work? | LegalZoom
SOLVED] We Are Preparing a Mailbox For The User (2023)
Restoring 365 mailbox - hybrid (We are preparing a mailbox for the user) - Microsoft Q&A
Lost in IT: Office 365 Error - stuck at "We are preparing a mailbox for this user"
Lost in IT: Office 365 Error - stuck at "We are preparing a mailbox for this user"