Summary: Migrating Thunderbird to Office 365 involves converting local MBOX files into a format compatible with Microsoft’s cloud (PST or direct API ingestion). While the IMAP Sync method (manual) is viable for small mailboxes, enterprise-scale transitions require a Professional MBOX to Office 365 Migrator to preserve folder hierarchy, attachment integrity, and header metadata. We all … Continue reading How to Migrate Thunderbird to Office 365 Step by Step?