Uploading Exchange OST files to Office 365 mailbox accounts is not straightforward because an OST (Offline Storage Table) file is linked to a specific Outlook profile and Exchange account. You cannot directly upload an OST file to Office 365. First, the OST file must be converted into a PST file, and then the PST can be imported into the Office 365 mailbox. If the OST file is orphaned, inaccessible, or very large, using a professional tool is the easiest solution. Tools like ATS OST to PST Converter allow users to convert Exchange OST files and upload them to Office 365 mailbox accounts safely and quickly.
Key Features of ATS OST to PST Converter
- Convert OST to PST without Outlook installation
- Direct export to Office 365, Exchange Server, and IMAP accounts
- Supports large OST files and batch migration
- Maintains folder hierarchy, email formatting, and attachments
- Works with corrupt or orphaned OST files
Basic Steps
- Install and launch ATS OST to PST Converter.
- Add the Exchange OST file into the software.
- Preview mailbox items like emails, contacts, calendars, and attachments.
- Select Export to Office 365.
- Enter Office 365 login credentials.
- Start the migration process.
The software will automatically upload OST mailbox data directly to the
Office 365 mailbox account.
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OST to PST Converter & Recover with Convert OST file to PST
