How to Move Mailbox from On-Premise to Microsoft 365 Easily

Written By Rohan Wiese
Updated on April 28th, 2026

Over the years, email and mailbox management have become one of the most crucial parts of modern businesses. It gets even more important when we transition from legacy infrastructure to cloud solutions. The procedure to move mailbox data from on-premises to Microsoft 365 helps users to migrate their email environment based on the requirements. In this article, we will discuss the effective methods to move mailboxes to Microsoft 365. Along with that, you would know how to use the Aryson Microsoft 365 Migration Tool for effective migration with less downtime. Download Now Purchase Now

User Query:

Sarah Williams on Spiceworks inquired: I have been managing our on-premise Exchange server for several years. Our IT team wants to move to Microsoft 365 to reduce costs & improve collaboration. I need to migrate user mailboxes without causing disruption. I want a reliable method to transfer data safely without loss.

Is there any simple way to move mailboxes from on-premise Exchange to Microsoft 365?

Table of Contents

Reasons to Migrate Mailbox from On-Premise to Microsoft 365

The process to move the mailbox from on-premises to Microsoft 365 is an effective way to reduce infrastructure costs & enhance email security. Other reasons include:

It eliminates the need for expensive on-premise server maintenance.
You can access your emails from anywhere with cloud-based mobility.
Moreover, it provides advanced security features with threat protection.
Users can benefit from automatic updates without downtime.
Additionally, the collaboration is improved with integrated applications.
Also, it makes sure of business continuity with disaster recovery solutions.

Things to Do For Pre-Migration Planning

Before you migrate the Exchange server to Microsoft 365, it is essential to properly plan the migration to achieve accuracy. The key planning steps include:

Evaluate your Exchange Server version & verify hybrid deployment requirements.
Moreover, make sure that your domain is verified in Microsoft 365.
Also, you can schedule the migration during off-peak hours to minimize impact.
Create complete backups of all mailboxes before migration.

How to Move Mailbox to Microsoft 365?

In this section, you will find the best possible methods to migrate or transfer your on-premise mailbox data to Microsoft 365. Follow the entire blog to do so.

Transfer Mailbox Data from Legacy to Cloud
Quick Solution for Migration

Approach 01: Guide to Transfer Mailbox Data from Legacy to Cloud

The hybrid migration method provides seamless integration between on-premise Exchange and Microsoft 365. This approach maintains both on-premise & cloud mailboxes during transition. After configuring the hybrid environment, you can move mailboxes remotely while users continue working. Now, follow the Microsoft 365 email migration steps given below.

Steps to Move On-Premise Mailbox to Cloud:

To initiate, install the latest Cumulative Update for Exchange Server.
After that, download & launch the Hybrid Configuration Wizard from M365.
Now, enter the required credentials for on-premise & Microsoft 365 admin accounts.
The wizard will create a migration endpoint for mailbox moves.
Thereafter, set up the directory synchronization using Azure AD Connect.
Next, move to the Exchange Admin Center >> Migration >> New batch.
After that, select “Remote move migration” for transferring mailboxes.
At last, add mailboxes & start to migrate data in batches.

Important Note: Users can even use the “manual complete” option in batches to sync 95% of data in the background when users access their on-premise mailbox.

Drawbacks of the Manual Method

Users must acquire technical expertise in Exchange administration.
You need to set up the complex hybrid infrastructure on your own.
Moreover, it consumes significant time to troubleshoot the connectivity issues.
With this method, users must manually handle migration monitoring.

Approach 02: Advanced Solution to Move Mailbox to Microsoft 365

The Aryson Microsoft 365 Migration Tool is a reliable solution for enterprises and IT admins who need to move on-premise data to M365 efficiently. You can use this software to migrate large datasets with complete accuracy & minimal effort. Moreover, it provides users with flexibility and allows them to apply filters & select specific folders. Additionally, users can securely log in to their source and target accounts with the help of Modern Auth2.0 or the Impersonation method. This makes the software suitable for organizations that prefer to opt for a smoother transfer to the cloud with minimal downtime.

Steps to Move Mailbox from On-Premise to Microsoft 365:

Download and run the Aryson Microsoft 365 Migration Tool.
Select Copy Mailboxes from the centre panel of the software.
Enter the credentials of the source tenant and press Add connection.
After that, select the on-premise mailboxes to migrate to Microsoft 365.
Provide the ID and password of the destination tenant account >> Add Connection.
Perform the mapping of the mailboxes by selecting the destination tenants.
If required, use the various features of the software and click Start Migration.

Advantages of Opting For the Aryson Microsoft 365 Migration Tool

It makes the migration process faster & easier to manage.
Users can migrate without complex hybrid configurations.
You can even convert a User Mailbox to a Shared Mailbox.
It supports bulk mailbox migration, saving considerable time.
The interface is intuitive without requiring advanced skills.
It maintains data integrity while transferring emails.
Users get filtering options to customize the migration scope.

End Note

In this article, we discussed some of the most reliable ways to move mailbox to Microsoft 365, such that the data is kept secure in the cloud. You can go for the manual hybrid method or opt for the above automated software based on your expertise & mailbox count. The manual approach works for organizations with IT resources. While an automated tool makes the process easier for large-scale migrations. Once you choose the right method, the migration process becomes smooth and simpler. Also, if you face any issues, you can reach out to the support team for help.

FAQs

Q1. Can I migrate mailboxes from on-premise Exchange to Microsoft 365?

Ans: Yes, with the help of the Aryson Microsoft 365 Migration tool, you can efficiently migrate on premise Exchange to Microsoft 365 without downtime.

Q2. Will users lose access to emails during migration?

Ans: No, with hybrid migration or automated tools, users maintain access throughout the process.

Q3. How long does mailbox migration take?

Ans: However, it depends on the size of the mailbox; it will take you just a few minutes to migrate on-premise mailboxes to a Microsoft 365 account.

Q4. Can I migrate specific folders instead of entire mailboxes?

Ans: Yes, with the help of the Aryson Microsoft 365 Migration tool, you can easily migrate specific folders instead of entire mailboxes.

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About The Author:

Rohan Wiese

Rohan Wiese is a Technical Writer at Aryson Technologies. He is an expert Email Forensic, Cloud Computing, and a passionate nerd with over 10 years of experience in technical content writing. He writes about Cloud Migration, Database Recovery, Email Backup, Windows, Mac, and Tech.