To migrate Google Takeout emails to Office 365 without losing attachments, first export the required mailbox data from Google Takeout in MBOX format. Once the MBOX files are available, you can use the Aryson MBOX Migrator Tool to transfer the emails directly to Office 365. The tool allows users to select MBOX files or folders, provide Office 365 account credentials, and map the source mailbox data to the appropriate destination folders.

The MBOX Migrator Tool is designed to preserve important email elements during migration, including attachments, email content, folder structure, metadata, sender and recipient details, and timestamps. It supports bulk migration, making it useful when multiple Google Takeout MBOX files need to be transferred to Office 365. Before starting the migration, users can apply available filters and select specific folders or emails as required. This makes it easier to migrate Google Takeout Emails to Office 365  while maintaining the original email data and attachments in the destination mailbox.