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Summary – In today’s fast-paced professional landscape, many individuals and organizations are making the transition to Microsoft Outlook. The reasons are abundant – from enhanced security measures to the convenience of offline access and seamless data management. If you find yourself contemplating the need to sync your Lotus Notes Calendar with Outlook, you’re in the right place. In this article, we’ll guide you through two manual methods and introduce you to an automated tool designed to streamline the process of syncing your Lotus Notes calendar with Outlook.

Lotus Notes and Outlook stand out as two popular email clients frequently chosen by both individuals and organizations. They offer a robust suite of features, including email, calendars, address books, task management, and database capabilities. However, a significant differentiator sets these two apart: Lotus Notes relies on the NSF file format for file storage, while Outlook utilizes the PST file format.

In today’s business landscape, the migration of Lotus Notes data, including the Calendar, to Microsoft Outlook has become a prevalent choice among businesses and professionals. This shift is primarily driven by Outlook’s wealth of additional features and robust security measures. Below, we’ll explore some common reasons that underscore the importance of syncing your Lotus Notes Calendar with Outlook:

However, due to the disparity in file formats employed by both platforms, users often encounter challenges when attempting to export data to Outlook. To successfully sync your Lotus Notes calendar with Outlook, it is essential to convert NSF files into the PST file format. In this blog, we will guide you through two distinct methods for efficiently exporting Lotus Notes calendar data to Outlook.

Manual approach to sync Lotus Notes Calendar with Outlook

The manual process of syncing the Lotus Notes Calendar with Outlook can be broken down into two distinct phases. In the following sections, we will outline the steps for each of these phases.

Phase 1- Convert Lotus Notes Calendar into ICS Format
  • Open the Lotus Notes application on your system and select Calendar.
  • You can view the calendar entries by clicking on the View option.
  • Select the File tab and from the drop-down menu, select Export.
  • The Export dialogue will appear. Here, give a name to the converted (NSF to ICS) File under the box Filename.
  • Under the Save As option, select the file type as Calendar File (.ics). Click on the Export option.
  • iCal Export dialogue box will appear. Select the radio button, “All Documents.” Click OK.
Phase 2- Import ICS file to MS Outlook
  • Launch Microsoft Outlook and click File from the menu bar.
  • Select Open & Export option from the left panel and click on Export/Import.
  • Select ‘Import an iCalendar,’ and then click Next.
  • Browse and select the ICS file that you created in the first stage.
  • Select Calendar as the destination for iCS file.
  • Select the option Import from the different options that appear on the screen, and your desired ICS calendar file is imported to Outlook.
Professional approach to sync Lotus Notes Calendar with Outlook

Another method to seamlessly sync your Lotus Notes Calendar with Outlook involves the use of professional software or a third-party tool, offering a swift and efficient conversion process. One such reliable tool is the Kernel for Lotus Notes to Outlook Converter. This software excels in exporting data from Lotus Notes NSF files to Outlook PST files with precision. It offers the flexibility to filter data according to your specific requirements prior to migration.

Additionally, you have the convenience of previewing the converted files before finalizing the process. What makes this professional tool particularly user-friendly is its intuitive interface, requiring minimal technical expertise. Furthermore, it allows you to divide large-size NSF files into smaller PST files without compromising data integrity.


The Lotus Notes calendar serves as a repository for critical information and tasks that demand regular attention and cannot be overlooked. Regrettably, there are no direct methods available to seamlessly share Lotus Notes Calendar entries with Outlook. In this blog, we have explored both manual and professional approaches to syncing the Lotus Notes Calendar with Outlook.

The manual method, while feasible, is often time-consuming and doesn’t guarantee complete results. Additionally, it’s primarily suitable for smaller datasets. Conversely, a professional solution like the Kernel NSF to PST Converter offers efficient and rapid results. You can start by utilizing the trial version to witness its flawless performance before opting for the a NSF to PST Converter full version.