Forum Discussion
Planning to Migrate OST Files to Microsoft 365 - Need Some Guidance Before I Start
Hey folks, I have a task coming up where I need to migrate OST files into Office 365 mailboxes. A few of the OST files I'm dealing with are orphaned or corrupted which is making me a bit nervous abo...
Hi, I’d be careful with OST files because they’re tied to the original Outlook profile/mailbox. If the profile still opens, export to PST from Outlook first. For orphaned or corrupt OSTs, the safer path is restoring from the original mailbox, backup, or eDiscovery if available. After import, compare folder counts, item counts, dates, and spot-check attachments before calling the migration done.