Top 5 NSF to PST Converters in 2026

A balanced comparison of features, pricing, and trade-offs for migrating Lotus Notes mailboxes to Outlook

For many years, migrating away from Lotus Notes has been an ongoing project for many organizations and IT departments realize that utilizing one of the available converters will provide the best method for obtaining NSF mailboxes into Outlook without experiencing data loss. The greater challenge is in discovering which tools provide true delivery, free of any limitations. Within this guide, we will evaluate five converters used to convert NSF to PST in 2026; focusing on: strengths, weaknesses & pricing.

Key Takeaways

NSF to PST converter software helps move email, contact, calendar, and task information from Lotus Notes (Lotus Domino) to an Outlook-compatible PST file because Outlook cannot directly read an NSF file.

· Softaken NSF to PST Converter has benefits of having a simple user interface, many types of export formats available, and a fixed cost of software.

· Stellar Converter for NSF is an excellent option for businesses performing large volume migrations and/or exporting data to Microsoft 365; however, it is typically more expensive than other options.

· Shoviv has a well-defined trial limitation and incremental export features that help eliminate duplication.

· SysTools is developed for larger organisations performing migration to Domino Servers, while also including advanced mapping and connectivity features.

· Kernel also supports SmartCloud Notes and Verse environments when performing standard conversions from NSF to PST. 

Most of these converters require Lotus Notes to be fully installed and set up on the computer performing the conversion, whereas Outlook is often optional for the conversion.

What Is an NSF to PST Converter and Why Do You Need One?

The NSF to PST converter converts Lotus Notes' NSF files into a PST file format that is compatible with Microsoft Outlook because Outlook does not support opening Lotus Notes' NSF files directly. Because there is no built-in method to migrate data between these two file types, third-party applications must be used to maintain mailbox structure, include attachments, and retain metadata while migrating your mailbox from Lotus Notes to Microsoft Outlook: Microsoft Office.

Why Are Organisations Still Migrating from Lotus Notes to Outlook in 2026?

While HCL still provides support for Notes/Domino, a growing number of organisations are transitioning to Outlook or Microsoft 365 as they look to gain cost efficiencies, integrate their ecosystems and improve ease of administration.

Some of the reasons for this change are:

• Reduced infrastructure overhead for the maintenance of Domino servers

• Improved integration with Microsoft 365 applications such as Teams and SharePoint

• Larger pool of skills and talent working with Outlook

• Decreased risk of vendor lock-in when using an outdated legacy system.

Utilising a dedicated conversion tool for migration of email is critical to ensuring that data isn't corrupted, emailed attachments are not lost, or the original folder tree isn't destroyed.

What Should You Look for Before Buying an NSF to PST Converter?When selecting a tool to use, it should be based on what is possible to do with it. This is different from marketing materials, which can have many exaggerated claims.

Here are key features you should look for:

• Folder architecture, Metadata, and Attachments – will your data remain intact?• Ability to convert multiple NSF files or mailboxes simultaneously?

• Can you convert encrypted NSF files? This is critical for enterprise-level environments.

• Support for Domino servers – can you migrate large numbers of files?

• Do they offer a demo version so you can try out the software before you buy?

• What is their pricing model (per user, per mailbox, or unlimited)?

• Does it support current versions of Outlook and Microsoft 365?

If you have experience with converting OST to PST files you will also notice that converting NSF files is largely dependent upon the environment of the Notes client.

Top 5 NSF to PST Converters in 2026

1. Softaken NSF to PST Converter

Softaken is the easiest to pick up and start using because of its casual, no-frills interface and simple, flat-rate pricing. Ideal for users who want an operational PST file but do not want to spend the time or effort to learn how to use it. It is also suitable for individuals, consultants, and small, medium-sized teams as well as large-scale purposes. The software supports all Windows OS versions like 11, 10, 8.1, 8, and 7 without needing any application.

Pros:

• Easy-to-follow instructions provide seamless transfers from your email account (three to four-step process).

• Supports multiple export formats (PST, EML, MSG, etc.).

• Does not require the installation of Microsoft Outlook to perform conversions:

• No additional costs after the purchase of the product due to hidden pricing structures associated with email conversion software products.

• Better for everyone – from small individuals/small teams to large scale/enterprise migrations

Cons:

• Trial version has limitations on exportations

Demo Limitations: Limited number of items converted per folder

Best suited to: Most users — new users, budget-conscious buyers, consultants, and small-to-mid-size teams looking for the fastest path to a clean PST file.

2. Stellar Converter for NSF

Stellar is the enterprise migration solution available.

Advantages:

• Can handle the largest of NSF files.

• Can export directly to Microsoft 365.

• Provides advanced preview and filtering capabilities.

Drawbacks:

• More costly towards higher tiers.

• Some features require a 'Technician' license to use.

Demo Limitations:

• Only saves a limited number of items in each folder.

Ideal User Group: Large Enterprises/Migrating to Hybrid Cloud.

Shoviv NSF to PST Converter

When it comes to controlled migrations, Shoviv is aimed at balancing cost with advanced functionalities.

Pros

• Incremental export so there are no duplicate items

• Supports batch conversion

• Less cumbersome than most vendors have a 50 item per folder limit for the demo version

Cons

• Should be more intuitive for 1st time users

• Requires some learning curve

Demo limit: 50 items per folder

Best for: Mid sized migrations that can need to restart.

4. SysTools NSF to PST Converter

SysTools is designed for complex enterprise networks.

Pros:

• Domino server connectivity

• Advanced mapping (canonical to SMTP)

• Bulk mailbox migration capability

Cons:

• High price for full functionality

• Too much for small migrations

Demo Limitations: Limited number of exports per folder

Best for: Enterprise Domino migrations

5. Kernel NSF to PST Converter

Kernel is adaptable, particularly when it comes to cloud-based Notes environments.

Advantages

• Supports SmartCloud Notes and Verse

• Multi-exit options, such as Office 365

• Good preview functions

Disadvantages

• Pricing is dependent on edition

• The interface has aged somewhat

Demo limit - Export of a limited number of items

Ideal for - Hybrid or cloud environment Notes implementations

Feature-by-Feature Comparison

How the five converters stack up on the capabilities that matter most:

Pricing Comparison

Softaken’s flat, one-time fee is the easiest to predict; enterprise tools price by tier or volume.

Your choice depends on your use case:

• Softaken = individual to enterprise migration

• SysTools/Stellar = enterprise migration

• Shoviv = budget-friendly with pro features

• Kernal = cloud/hybrid Notes 

However, if you're looking for one tool that can easily support the majority of these solutions. This is a user-friendly application for users who are new to it yet offers flexibility regarding the file types it can export into, so it provides capabilities for both agencies/consultants and individuals; it doesn't exceed the price limits of either group.

An individual who cannot determine their category likely won't go amiss in beginning with this and can get the work done to large-scale enterprises.

Conclusion

Data Loss during Lotus Notes migration is the biggest risk that the best NSF to PST converters eliminate.

The converters listed here have been shown to work in various ways, and you can find out which one fits your needs best, depending on the size of your migration project, your budget and how you plan to use it. Softaken NSF to PST Converter has been rated as the best all-around product out of the five converters covered by these articles.
Its easy step-by-step instructions for using the software, its ability to export to multiple formats, and its simple, flat fee pricing means that it will work well no matter what your level of experience with computers or your budget. If you want one product to start out with, this would be it.

Frequently Asked Questions

Answers to the questions most often asked before choosing an NSF to PST converter.

Can Outlook open an NSF file directly?

Unfortunately, Outlook cannot read the NSF file format natively. This requires conversion of email to PST before you can use these files from Lotus Notes with your Microsoft Office / Outlook email applications. To do this, you must utilize a converter tool which has been designed specifically to perform this task.

Do I need Lotus Notes installed to convert NSF files?

In nearly all cases, this is correct. Most of the converters mentioned in this guide, and in particular Stellar, Shoviv, SysTools, and Kernel, need an operational Notes/Domino environment in order to properly view an NSF file. Something that are unique about Softaken, though, is that they don't require the installation of Outlook; however, you will still usually require access to Notes in order to obtain the NSF file itself.

Will I lose emails, attachments, or folder structure during conversion?

Provided that you utilise a recognised dedicated conversion and adhere to the proper procedures, you should not experience any loss of data. Many times, users will attempt to perform a manual workaround by doing things themselves rather than using the appropriate software for purposes such as this, which can lead to data loss. As a precaution, you should always begin by running a demo conversion to confirm that the output is comparable to the original NSF file before beginning a complete migration.

What do the free demo versions actually let me do?

Generally, the average free demo will allow you to preview and convert a limited number of items in each folder (anywhere from 10-50). Before purchasing a license, you will be able to confirm formatting, attachments and folder structure for the items in the demo.

How long does an NSF to PST conversion take?

Your personal mailbox size, total number of items to be converted and how powerful your computer is will all affect how long it takes for a conversion to complete. Small personal mailboxes can usually convert in a few minutes, while an enterprise of multiple Domino mailboxes could take significantly longer. It would also be beneficial to run a demonstration of your actual data to gain a better estimate for converting your own email account.