You can use the MailConverterTools OST to Office 365 Converter to seamlessly transfer OST files to your Office 365 account, including all emails, attachments, and details. This tool ensures that all folders and mailboxes from the OST file are moved to Office 365 with no data loss. Additionally, the Quick OST to Office 365 Conversion feature makes it simple to transfer emails, attachments, and folders without losing any information.