
Softaken OST to NSF Converter
Most endowed solution for converting OST files into Lotus Notes NSF files
One time feeEmails197 impressions#838 of its week
Converts Outlook OST files to Lotus Notes NSF files on Windows.
- for
- IT admins and users needing to migrate Outlook offline mailboxes to Lotus Notes.
- pricing
- freemium · free trial
Key features
- Batch migration — Convert multiple OST files at once regardless of Outlook version.
- Folder hierarchy preservation — Keeps original folder structure and email attributes in the NSF output.
- ANSI & UNICODE support — Handles both ANSI and UNICODE OST file types.
- Date range & selective export — Filter items by date or folder before exporting.
- Preview pane — View mailbox items in a left-pane preview before conversion.
- Contact & calendar export — Exports contacts to VCF/CSV and calendars to ICS alongside NSF.
- No Outlook required — Works with offline OST files without configuring Outlook.
- Windows only — Runs on Windows 7/8/10/11 with minimal system requirements.
Use cases
- Migrate an employee’s Outlook archive to Lotus Notes after they leave the company.
- Batch convert several departmental OST files to NSF for a Lotus Notes migration project.
- Extract contacts and calendar events from OST files into VCF/CSV and ICS for import into Notes.
- Preview and selectively export only recent emails from a large OST mailbox.
Softaken OST to NSF Converter FAQ
Do I need Outlook installed to convert OST to NSF?+
No, the tool works with offline OST files and does not require Outlook configuration.
What does the demo version allow?+
The demo is free and lets you export up to 10 emails; all other features are identical to the full version.
Are contacts and calendar items converted?+
Yes, address book entries can be exported to VCF/CSV and Outlook calendars are saved as ICS files.
Is there a file-size limit for conversion?+
The product page does not specify a size limit; users have reported converting large OST files without issues.
Which Windows versions are supported?+
Windows 7, 8, 8.1, 10, 11 and other Windows desktop versions.
Will the original email formatting and attachments be retained?+
The converter preserves email properties, formatting, and attachments in the resulting NSF file.
Summarized by DevHunt from softaken.com · Sep 28, 2026. Details may change; check the official site.


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