Can I import Maildir data to multiple Office 365 accounts at once?

[ArjunMehta]

Yes, you can import Maildir data into multiple Office 365 accounts at once, but not directly in native Microsoft tools. This is typically done using third-party migration utilities such as MacSonik Maildir Converter tool or enterprise migration platforms. You can configure batch migration jobs to target different mailboxes in Microsoft 365, allowing parallel or sequential imports. Each account requires proper admin credentials, network permissions, and mapping rules to avoid duplicate or misrouted emails during import. However, native Outlook or Microsoft 365 admin centers do not support direct bulk Maildir ingestion without conversion or staging. Therefore, using specialized tools ensures scalability when migrating multiple Maildir datasets across several tenants or organizational units. Before proceeding, it is recommended to test migrations on a small sample, verify folder hierarchy preservation, and ensure compliance with Microsoft 365 tenant policies to prevent data loss, authentication errors, or mailbox throttling issues across multiple target accounts during large scale imports to ensure secure, consistent, and auditable migration outcomes overall successfully.