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How to convert Lotus Notes to Office 365 manually


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The manual Lotus Notes migration process has four steps:

NSF database files backup for Lotus Notes

Creation of new user mailboxes in Office 365

Configuration of IMAP connections (TCP/IP ports) for the user accounts

Synchronize emails from Lotus Notes to Office 365 via an IMAP connection


Begin the migration process by following the steps below:


Perform a Lotus Notes Backup

During migration, there are chances of things going wrong, so it makes sense to back up the data in your IBM Lotus Notes by backing up the NSF database files containing the information about users’ mailboxes. Backups are important because they provide a restore point (of sorts) that you can use if your migration process fails and the NSF files are corrupted.


Create Mailboxes for Users on Office 365

You need to create a new mailbox for each user account that you are planning to migrate from Lotus Notes to Office 365. For the ease of cross-verification, ensure that all the details are the same between the Office 365 user profile and their Lotus Notes email client profiles.


Enable the IMAP Ports for Users

The IBM Lotus Notes to Office 365 manual migration takes place through the IMAP protocol, so you need to enable the TCP/IP ports for all users whose mailboxes are to be migrated to Office 365. To do this, follow the steps given:


Navigate to the ‘Domino Administrator’ tab in your Lotus Notes

Click on the ‘Configuration’ tab in ‘Domino Administrator’

Choose the appropriate Server file (or document)

Go to ‘Ports’ tab, then ‘Internet Ports’ and then ‘Mail’

Change the ‘TCP/IP Port Value Status’ to ‘Enabled’ for the Mail (IMAP) settings (leave the default TCP/IP port number value to ‘143’ as that seems to correspond with the IBM Domino server)

Click ‘Save’ to apply the changes

Establish a Connection with the IMAP Connector

With the TCP/IP ports of users’ accounts enabled, it should now be easy to establish a connection through the IMAP connector present in the IBM Lotus Notes email client. You can now directly synchronize your Lotus Notes email data to Office 365 once the connection has been successfully established. Depending on the amount of data you are migrating, the process may take longer.

Once the process completes, your Office 365 migration process is complete. Learn more about different Office 365 migration in detail at


I hope this is helpful!


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Use an automated solution i.e. CubexSoft NSF to Office 365 migration software that helps you to directly migrate Lotus Notes database to Office 365 cloud account with all details and attachments.  It is a very simple GUI, anyone can easily handle and works with this software without having technical knowledge. It allows you to batch export NSF files to O365 cloud account without any data loss. It was compatible with all the latest and below versions of MS Outlook, Lotus Notes, and Windows OS including Windows 10. 

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