How to handle professional OST to Office 365 conversion?

[jackdanial]

Opening or directly import OST files to Office 365 isn’t possible through Outlook. If the OST is active with its original profile, you can export it to PST using Outlook’s Import/Export feature and then upload the PST into Office 365 via the Import Service. However, for orphaned, corrupted, or multiple OST files, this method fails. In such cases, professional tools like BLR OST Converter are highly effective. They directly migrate OST files to Office 365 while preserving emails, attachments, calendars, contacts, and folder hierarchy. This ensures a secure, quick, and complete transfer—ideal for business or professional needs.