In 2026, a practical way to import OST files to Office 365 is to use a dedicated OST migration tool that can transfer mailbox data directly to Microsoft 365. The Aryson OST to Office 365 Migration Tool  provides a streamlined approach for users who need to migrate data from standalone or inaccessible OST files without manually extracting and transferring individual mailbox items.

Aryson supports emails, attachments, contacts, calendars, tasks, notes, and other mailbox data, while maintaining the original folder hierarchy and important email properties. It also offers batch OST migration, selective folder selection, OST file preview, date-based filtering, attachment preservation, and support for large OST files. For organizations handling multiple users, these features can simplify the process of mapping different OST files to their respective Office 365 mailboxes. Therefore, when you need to import OST file to Office 365, Aryson provides a centralized option for managing the migration with less manual effort.