EdbMails is the one of the best solution that allows you to migrate Zimbra mailboxes to Office 365 efficiently. It allows you to load multiple mailboxes using CSV, automatically maps the source Zimbra mailboxes with the Office 365.
Zimbra to Microsoft 365 Migration Guide – BitTitan Help Center
Zimbra Mail Server Migration Tool to Take Backup of Zimbra Mail
How to Migrate Zimbra to Office 365?
Zimbra to Office 365 Migration Easy Way to Migrate Zimbra to O365
Office 365 Migration Guide: A Step-by-Step Overview - Medha Cloud
Migrate Google, Zimbra and more to Office 365
How to Migrate Zimbra to Office 365?
How to Migrate Zimbra to Office 365 PST Files - Download Freeware Blog
Zimbra to Microsoft 365 Migration, For Windows at Rs 1000/hour in Chennai
Email Archive Migration8 Tips for Zimbra to Office 365 Email Migrations - Email Archive Migration