If you are trying to safely
import Maildir files into Office 365 without losing emails or folder structure, you should preserve the original Maildir hierarchy and use a reliable migration method that supports folder mapping. The safest approach is to first validate your Maildir data (check for corruption or missing files), then use a trusted tool MacSonik Maildir Converter.IMAP-based import process that keeps directory structure intact. Tools that support direct Office 365 export typically map Maildir folders to Exchange Online folders automatically.
Before migration, take a full backup of your Maildir data to avoid accidental loss. During the process, ensure attachments, timestamps, and subfolders are preserved by enabling “maintain folder hierarchy” options if available. Avoid manual drag-and-drop methods, as they often flatten or break structure. After import, verify the mailbox in Office 365 by comparing folder counts and sample emails. For large datasets, perform a small test migration first, then proceed in batches to reduce risk and ensure consistency.
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