NSF to PST Converter Tool for Lotus Notes: Free Download

How to download and use NSF to PST Converter Software

1. Open the Lotus Notes database

Start the NSF to PST Converter tool and point it at your .nsf or .ntf file. A copy on a network share or a USB disk works the same as one in the Notes data folder.

2. Look through the mail first

The folder tree and the message list load straight from the file. Subject, sender and date are in the list, with the size beside them, so you see what the archive actually holds before converting it.

3. Narrow down what goes out

Set a date range or search Subject, From and To. Deleted items can be left behind. Whatever the list shows after filtering is exactly what will be written.

4. Write the PST and open it in Outlook

Choose where to save the file and start the conversion. To read the result, open Outlook and use File, Open and Export, Open Outlook Data File.

Notes 5 and newer

Reads .nsf and .ntf databases in the ODS 41 to 55 range, which covers Notes 5 through the current 14.x line. Both extensions are the same format on disk, so the program opens a template file the same way it opens a mailbox. Reading is done by a separate 64 bit process, which is what lets a multi-gigabyte database open at all.

Filter before you convert

Deleted and Trash items can be excluded, inline images kept or dropped. Filtering happens inside the reader, not after the export, so the list on screen is what the PST receives.

Attachments come out whole

Files are pulled out of the note, including the ones Domino stored compressed on the server. With server-side compression on, a tool that skips this step hands you a mailbox with no files in it at all. Expanded attachments were checked against their declared size and their own file-type signature on our test corpus before this shipped.

Addresses Outlook can reply to

Notes keeps names in own canonical form, like CN=John Smith/O=Acme, which Outlook cannot answer. The real SMTP address is taken from the message headers where it survived, and built from the canonical name where it did not.

Folder tree, counted once

Inbox, Sent and Drafts are recognized by their view formulas, and your own folders keep their names. A message that sits in a folder and in All Documents at the same time is written to the PST once, not twice.

It tells you what went wrong

An unreadable database gets a reason instead of silence. An ODS version below 41, local Notes encryption, or a file that turned out not to be a Notes database at all. An empty list is never shown as if the mailbox itself were empty.

Notes / Domino release	On-Disk Structure	Status
Notes 5 - 8.5	ODS 41 - 51	Supported
Notes / Domino 9.x	ODS 43 or 52	Supported
Notes / Domino 10.x	ODS 52 or 53	Supported
Notes / Domino 12.x - 14.x	ODS 52 - 55	Supported
Notes 4.x and older	ODS 20 and below	Not supported - the file is reported as unreadable, never as empty

NSF to PST Converter

Languages

File Size

6 Mb

Version

1.0

Last updated on

01/07/26

$ 49.99

🖥️ System Requirements

Windows 11/10/8.1/8/7 (32/64 bit)
Intel i3, AMD Ryzen 5 or above
4 GB of RAM or above
NVIDIA® GeForce® series 8 and 8M, Intel® HD Graphics 2000, Quadro FX 4800, Quadro FX 5600, AMD Radeon™ R600, Mobility Radeon™ HD 4330, Mobility FirePro™ series, Radeon™ R5 M230 or higher graphics card with up-to-date drivers
1280 × 768 screen resolution, 32-bit color
1 GB of free hard disk space or above

🙋 Frequently Asked Questions

❓ How do I convert an NSF file to PST?

Open the .nsf file in the NSF to PST Converter Software, check the folder tree that loads, filter the messages if you want only part of them, then save the result as a PST. Outlook opens that PST through File, Open and Export, Open Outlook Data File.

❓ What is an NSF file?

An NSF file is the database file IBM and HCL Notes keep their data in. Mail lives in a mail file, while applications and documents live in databases of their own. A mail NSF holds the messages, the folder structure and the attachments together in one file, which is why moving it to another mail client needs conversion and not a copy. That job belongs to an NSF file converter.

❓ What does NSF stand for?

Notes Storage Facility. The .ntf extension you may see next to it means Notes Template Facility. Same structure on disk, used for templates, and this NSF to PST Converter download opens both.

❓ Can I open an NSF file without Lotus Notes installed?

Short answer: yes, this is an NSF to PST converter without Lotus Notes. Long answer: most tools on the market ask for an installed Notes client because they let Notes read the file for them, and one vendor states outright that any other route is impossible. This program parses the NSF structure itself, so neither Notes nor a Domino server is needed. Outlook is only needed later, to open the PST you get.

❓ How do I open a Lotus Notes NSF file in Outlook?

Outlook has no NSF importer, so the file has to become a PST first. What you get here is a Unicode PST, the variant Outlook lets grow to 50 GB by default, and not the old ANSI file that was capped at 2 GB. After conversion it behaves like any other Outlook data file. Folders keep their names, dates and read state survive, attachments open.

❓ Does it convert contacts, calendar entries and tasks?

No. This version converts mail only, and that is a deliberate choice. Notes calendar entries, repeating meetings above all, often arrive damaged in Outlook, and we would rather leave them out than hand over invitations that open blank. Contacts and tasks are out of scope too. If the Notes address book was exported to CSV separately, a csv to vcf converter for vCard turns that spreadsheet into cards a phone or mail app can import.

❓ Where are NSF files stored in Lotus Notes?

Local databases usually sit in the Notes data folder, often C:\Program Files\IBM\Notes\Data, C:\Program Files\HCL\Notes\Data or, on 64 bit Windows, the same path under Program Files (x86), with a mail file named after the user. Archives are frequently kept in an archive subfolder or copied to a network share. Any copy works here. The file does not have to be registered with a Notes installation.

❓ Can I convert NSF to PST online, without installing software?

Not with this product, and that is on purpose. An online converter means uploading a whole mailbox, with everything colleagues wrote to each other, to a server you do not control. Conversion here runs on your machine, and the NSF never leaves it.

❓ Is there a free NSF to PST converter?

There is a free trial of the NSF to PST converter software. It converts a sample of the archive, and the size of that sample is counted from the whole database rather than from the folders you happened to tick. Up to 20 messages go through in full; above that the trial writes about a tenth of the database, never more than 100 messages. That is enough to see how your own archive comes out, folder names and addresses and attachments included, before you decide anything. The full version removes the limit.

❓ Which Notes versions does the converter support?

Databases written by Notes 5 and later, which is ODS 41 through 55. Files from Notes 4.x and older use ODS 20 or below and are not read. You do not have to know the number in advance: it is written inside the file, so the program reads it off a detached copy and tells you what it found.

Download NSF to PST Converter Software for Windows

How to download and use NSF to PST Converter Software

1. Open the Lotus Notes database

2. Look through the mail first

3. Narrow down what goes out

4. Write the PST and open it in Outlook

Why people download NSF to PST Converter Software for Lotus Notes mail

Notes 5 and newer

Filter before you convert

Attachments come out whole

Addresses Outlook can reply to

Folder tree, counted once

It tells you what went wrong

Who uses NSF to PST Converter Tool

IT admins mid-cutover

Migration contractors

Anyone holding an inherited archive

Supported Notes databases

🖥️ System Requirements

🙋 Frequently Asked Questions

❓ How do I convert an NSF file to PST?

❓ What is an NSF file?

❓ What does NSF stand for?

❓ Can I open an NSF file without Lotus Notes installed?

❓ How do I open a Lotus Notes NSF file in Outlook?

❓ Does it convert contacts, calendar entries and tasks?

❓ Where are NSF files stored in Lotus Notes?

❓ Can I convert NSF to PST online, without installing software?

❓ Is there a free NSF to PST converter?

❓ Which Notes versions does the converter support?

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