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IBM Lotus Notes is one of the best business email clients for organizations that require complete email and collaboration services. The software comes with many unique features like different security levels, file attachments, and the ability to send encrypted emails.

It is a powerful, multithreaded email client with a complete set of tools for users working in online or offline mode. IBM Lotus Notes supports organizing and automating your business processes, applications, and team activities. The application is extremely secure and works efficiently on Windows, Linux, and Mac operating systems.

Despite its robust features, users sometimes face problems while working on it. For instance, many users reported the error 1325 while using Lotus Notes, which often causes problems accessing the data. “Lotus Notes Error 1325 – not a valid filename” is one such issue that can arise due to various reasons.

In this article, we will discuss how you can resolve the Lotus Notes Error 1325 with unique methods. Besides, we’ll also talk about an alternative solution to fix the error.

Causes of Lotus Notes Error 1325

The Lotus Notes error 1325 can arise for multiple reasons, like the sudden shutdown of the system, network failure, etc. However, the most common reasons behind the error are:

  • The Lotus Notes software is not installed properly on the system.
  • A virus or other malware infects the computer memory.
  • There has been some corruption in the operating system registry files.
  • There has been some corruption in the Notes installation files.
  • The user account does not have permission to access Lotus Notes on the system.
Lotus Notes Installation Error 1325 Indicators

The good part is when you’re about to receive this error; you might get some indications from it. The error displays the following messages before appearing.

  • The notice “Error 1325 – is not a valid file name” is shown directly.
  • While operating, the local machine freezes for a few seconds.
  • The response time to keyboard and mouse input is slow.
  • The presently open window shuts suddenly.
  • When an application is running, the entire system crashes.
Ways To Resolve Lotus Notes Error 1325 Manually

Lotus Notes error 1325 is a common error that occurs while your Lotus Notes client tries to connect with the mail server. This error may appear due to corruption in the network connection between the client and server, improper settings in the Domino server, driver or registry issues in the client, etc. You can apply one of the following manual methods to resolve this issue.

Update Your System Drivers

This common error can arise if your system drivers are outdated. Therefore, you should check and update your system Drivers from time to time.

  1. Launch Control Panel on your local PC.
  2. Select Device Manager from the menu.
  3. Right-click the unit and select Properties from the drop-down menu.
  4. Choose Update Driver Software from the drop-down menu.
  5. Your system Drivers will be updated.
Check for Corrupted Registry Entries

If you are getting this error, there may be corrupted registry entries of Lotus Notes on your computer. You need to repair these entries. You can do it manually or use third-party software.

  1. Type Run into the search field.
  2. Enter Regedit in the Run window and press Enter.
  3. Select File -> Export from the File menu.
  4. Choose the path where you want to save the file with the REG extension.
  5. Select the REG extension and double-click it.
  6. It will resolve the registry error by restoring it.
Not Enough Storage

Sometimes, if there is not enough space on the drive where Lotus Notes installation is located, you might get the error. In this case, you need to check the available disk space and free up some space by moving or deleting unused files. If necessary, you can move your Lotus Notes installation to another drive or delete files that you don’t need anymore. You can also migrate IBM Notes emails to Office 365 that are large enough to cause storage problems.

Server Configuration

Check the server configuration Lotus Domino server is not Compatible with your Lotus Notes client in terms of path or port settings. This can be resolved by checking the grounds of the Domino server.

Troubleshoot the issue by checking your Lotus Domino server’s “Lotus Notes Client Access Settings,” which can be found in Control Panel -> Administrative Tools -> Internet Information Services (IIS) Manager.

Check The Version

The Lotus Notes client version 6.0 is not compatible with versions 4.6 and 5.0 of the Domino server application. Upgrade to the latest version of Lotus Notes client, which is supported on your Domino server by checking 8.5 x, 8.5, 8.5, or 8.5 xm versions depending on your requirements and upgrade that using IBM support site or IBM developers network website.

Update IBM Lotus Notes

The last method to fix the error is to update the IBM Lotus Notes in your system. Sometimes, the error 1325 can appear due to using an older version of IBM Lotus Notes.

  1. Open your computer’s Control Panel.
  2. Right-click the Lotus Notes program in the Program Files folder.
  3. Choose Uninstall from the drop-down menu.
  4. Now, download and reinstall the application again and see if the error is gone.

In case none of the above methods work for you, the ideal solution is to use an automated tool like Kernel for NSF to PST Converter that allows you to fix the corruption errors and convert your file to PST format. The tool is equipped with advanced algorithms that enable you to scan the corrupt NSF file and convert it to Outlook PST format. You can even convert multiple NSF files to PST with the help of this tool.


IBM Lotus Notes is a great utility that works well for multiple businesses helping them handle their email communication and data. However, it is also prone to various errors like 1325. And it’s crucial to fix such errors, as they can damage your data to a significant extent. This article highlights the unique approaches to fix the Lotus Notes error 1325 and covers the alternative tool to convert NSF files to PST quickly. After you convert NSF files into PST format, then it will be accessible in MS Outlook application.

Kernel for Lotus Notes to Outlook
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