Univik NSF Converter for Windows
At a Glance
Key Features
No Lotus Notes Needed to Convert
Most converters make you install Lotus Notes first. This tool reads the NSF database on its own, so you can convert files from a machine that never had the client or an account that has closed.
At a Glance
Univik NSF Converter at a Glance
A quick scorecard of what the converter does, before you install anything.
No
Lotus Notes Install
Reads the NSF database on its own, no old client needed.
2in1
Mail and Contacts
Mail saves as PST, EML, MBOX, MSG or PDF; contacts as VCF or CSV.
0
Server Uploads
Everything runs locally on your own machine.
1
Run per Batch
Batch mode clears a whole folder of NSF files in one run.
$99
Buy Once, from $99
Free to try. Licences from $99, one-time, refundable in 30 days.
Key Features
What Univik NSF Converter Does
A few details decide whether the mail and contacts land in usable shape.
Mail and Contacts, Not Just Mail
Emails come out as PST or EML with their folders, and the names.nsf address book as VCF or CSV. One run moves both, so contacts land in Outlook or a phone beside the mail.
Folders and Details Kept
Inbox, sent and custom folders keep the same layout. Each message keeps its sender, recipient, subject, date and attachments. The result reads like the mailbox it came from.
Convert Only What You Pick
Load the NSF, then tick the folders or date range you need, instead of pushing a whole database through for one folder.
Clean Output Naming
Saved mail is named by sender, subject and date and filed to match the source, so large jobs finish tidy.
Originals Never Touched
The tool only reads your NSF files, writing to a folder you pick, so the source is never altered.
The Quick Reason
Why an NSF File Will Not Open in Outlook
An NSF file is a Lotus Notes database, built for one program and nothing else. Two things keep your mail and contacts stuck.
Trap 1: A Closed Database Format
NSF is the Notes Storage Facility format, built for Lotus Notes alone, so Outlook, webmail and PDF readers cannot open it. It is not one email but a whole database of mail, contacts and calendar.
Trap 2: The Usual Fix Needs Lotus Notes
Most guides tell you to install Lotus Notes and export by hand, one folder at a time. That needs a working client and a valid login, which many people no longer have after the move to Outlook.
Univik NSF Converter opens the database by itself. It walks the mail folders with their attachments and reads the names.nsf address book, then saves mail as PST or EML and contacts as VCF or CSV.
Inside an NSF
Inside an NSFWhat a Lotus Notes NSF Holds
One NSF is a whole database. Here is what sits inside and where each part goes.
The Mail File
Emails and Folders
Your mailbox NSF holds every email across inbox, sent and custom folders, with attachments and read state. It is the bulk of the database, saved as PST, EML, MBOX, MSG or PDF.
names.nsf
The Contacts Book
names.nsf is the address book of contacts with names, emails, phone numbers and groups. It saves as VCF for a phone or Outlook, or CSV for a spreadsheet.
Calendar and Tasks
The Rest of the Database
An NSF can also hold calendar entries, tasks and journal notes. These are read alongside the mail, so a converted PST carries more than messages.
Three Steps
Three StepsHow to Batch Convert NSF Files
No Lotus Notes, no server login, no exporting a folder at a time.
1
Add NSF Files
Load a single NSF, or point the software at a folder of NSF files to line up a whole batch.
2
Choose the Output
Send mail to PST for Outlook, or to EML, MBOX, MSG or PDF. Save contacts as VCF or CSV.
3
Convert and Open Your Mail
Start the batch, then open the mail and contacts in your current apps, with Lotus Notes not involved.
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Windows 11 and 10 · converts with no Lotus Notes and no Outlook · stays on your machine · help from the team that builds the tool
Where It Fits
Where It FitsWhen You Need an NSF Converter
Most people arrive here for one of these reasons.
Moving to Outlook or Microsoft 365
A company leaving Lotus Notes for Outlook or Microsoft 365 needs years of mail and contacts to come along. A PST carries the mailbox and VCF or CSV the address book, so work continues without a gap.
A Closed Account or Dead Server
The Domino server is off or the login no longer works, and all you have left is an NSF on a drive. Convert it once and read the old mail and contacts on your current PC, with no client to reinstall.
Legal Holds and Audits
Legal review or an audit calls for mail from a retired Lotus Notes account. Convert the mailbox to PST and PDF and the records open on any standard PC, no Notes client needed.
Old App, Locked Mail
NSF File, No Notes Login When the Domino server is gone and the NSF copy is all you have
Why this matters
When a company moves off Lotus Notes, the Domino server is often shut down and logins stop working. What people keep is an NSF copied from the mail directory. It looks unreadable, but the mail and contacts are still inside.
A Lotus Notes mailbox is usually the file named for the user under Data\mail\, with contacts in names.nsf. Copy those NSF files to any Windows PC, run Univik NSF Converter and get PST mail and VCF contacts, with no server, no login and nothing uploaded.
Compare the Paths
Three Routes for NSF Mail and Contacts
Each path moves part of the data. One moves mail and contacts together.
| What you need | Lotus Notes Export | Free Online Uploaders | Univik NSF ConverterTRIAL |
|---|---|---|---|
| Works without Lotus Notes installed | No | Yes | Yes |
| Batch many NSF files | One NSF each time | Upload one by one | All in one go |
| Contacts out with the mail | Separate export | Rarely | Yes |
| Mail stays on your PC | Yes | Sent off your PC | Yes |
| Keeps the folder layout | Manual | Rarely | Yes |
Exporting by hand needs a live Notes client. An upload site sends work mail off-site. This one needs neither.
What You Need
NSF Converter System Requirements
Operating System
It installs on 64-bit Windows 10 or 11. The one dependency is .NET Framework 4.8, already on up-to-date systems.
Lotus Notes Not Required
The converter reads the database on its own. No Lotus Notes, Domino server or login involved.
Memory and Disk
Everyday NSF files are fine with 4 GB of memory; use 8 GB for very large databases full of attachments.
Works Fully Offline
You go online only to fetch the setup file. The conversion itself makes no network connection.
| Software Information | Univik NSF Converter |
| Version | 6.8 (Latest) |
| Licence | One-time licence from $99, after the free trial |
| Platform | Windows 10 or 11, 64-bit only |
| Framework | .NET 4.8 or above |
| Reads | Lotus Notes NSF mail files and names.nsf contacts |
| Saves | Mail as PST, EML, MBOX, MSG and PDF; contacts as VCF and CSV |
| File Format | NSF from Lotus Notes and HCL Notes, version 6 through 14 |
Questions
Common NSF Converter Questions
Use an NSF converter tool like Univik NSF Converter. NSF is the Lotus Notes database format that no everyday app reads. The software opens it on Windows 11 or 10 and saves the mail to PST, EML, MBOX, MSG or PDF, with the contacts as VCF or CSV, with no Lotus Notes on the PC.
Yes. The software reads the NSF database directly and builds a PST that Outlook opens, with no Lotus Notes to install and no Domino login. The mail folders keep their layout, so the mailbox reads the same in Outlook.
Yes. names.nsf is the Lotus Notes address book, and the converter reads it alongside the mail. Contacts save as VCF for Outlook and phones, or as CSV for a spreadsheet. Names, emails, phone numbers and groups all come across.
Point the NSF file converter at a folder instead of a single file. Every database inside converts in one run, mail and contacts together. That is the fast way to move a set of old mailboxes, such as a team leaving Lotus Notes at once.
The software reads standard NSF databases on its own. If a database was locked with a Notes ID, it flags the file as protected and shows what it needs, so you learn this up front instead of hitting a failed run. A locked file may still need its matching Notes ID.
No. Every email keeps its attachments plus the sender, recipient, subject and date. Each contact keeps all of its fields. The source file is only read, never written to, so it stays intact for you to verify against.
Yes. An NSF copied off the mail directory still holds every message and contact, server or no server. Put it on any Windows PC and let Univik NSF Converter read it. Out comes PST mail and VCF contacts, with no Domino connection.
No. The program is self-contained. Reading one needs none of Lotus Notes, Outlook, Office or a Microsoft 365 plan. Outlook matters only later, to open a PST if that is the format you saved.
Check the Notes data folder, commonly at C:\Program Files\IBM\Lotus\Notes\Data. The mailbox is usually a file named for the user in the mail subfolder, and contacts sit in names.nsf. A backup copy can be on any drive or share.
This NSF converter software reads files from Lotus Notes and the later IBM Notes and HCL Notes releases, version 6 through 14. The product was renamed over the years but the NSF format stayed one family, so files across those versions convert the same way.
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Fact Checked
Univik has built email conversion software and parsers for closed formats since 2013, and our team wrote and reviewed this page. The details here, including the NSF layout, the names.nsf contacts file, where a Lotus Notes mailbox sits on disk and the Lotus-to-HCL Notes naming history, were checked against HCL and IBM Notes documentation.
Since 2013Format VerifiedUnivik Team