If you want to import MSG files into Office 365 mailboxes can be accomplished through several efficient and professional methods, depending on user requirements and technical expertise. One of the most common approaches is using Microsoft Outlook as an intermediary—by dragging and dropping MSG files into a configured Office 365 account. However, this method is time-consuming for bulk operations.
A more advanced and reliable solution is to utilize a professional MSG migration tool, such as the Aryson MSG file Converter. This software enables direct import of MSG files into Office 365 without requiring Outlook installation. It supports batch migration, preserves email metadata, attachments, and folder hierarchy, and ensures complete data integrity. Additionally, PowerShell methods can be used for enterprise-level migrations, though they require technical proficiency. For seamless, accurate, and large-scale migrations, automated tools remain the most recommended option, offering efficiency, security, and ease of use for IT administrators and business professionals.