Exchange on-premises versions were recently attacked by a Chinese state-sponsored group known as HAFNIUM. The group exploited the ProxyLogon vulnerabilities on the on-premise Exchange server to access and compromise the Exchange servers.
HAFNIUM is by far the most devastating and invasive attack on Exchange on-premises versions that compromised more than 30,000 organizations worldwide. Such Increasing threats and attacks on Microsoft Exchange on-premises server are pushing organizations and businesses across the globe to move their emails from Exchange on-premises to a more secure cloud-based Exchange Online or Office 365, which is unaffected by such attacks.
In this post, we discussed the best Office 365 migration tools to migrate all mailboxes from Exchange 2019, 2016, 2013, 2010, 2007, 2003, 2000, or 5.5 version to Microsoft Office 365 with 100% integrity and precision.
Although you can use the manual methods to migrate mailboxes and data from Exchange on-premises to Office 365, these methods are often complex and have many limitations. For instance, Cutover Migration limits 2000 mailboxes and takes several days to migrate the mailboxes, which causes extended downtime and impacts users. Also, it doesn’t work when the mailbox database is dismounted or offline.
An Office 365 migration tool overcomes these limitations and helps you quickly migrate mailboxes from on-premises Exchange to Office 365 without any risk of data loss or corruption. They facilitate 1:1 migration while maintaining the original folder structure and content. You can also add various filters to migrate desired mailboxes or mail items to Office 365 and save time.
1. Stellar Migrator for Exchange
Stellar Migrator for Exchange is a powerful, enterprise-grade tool designed for direct and seamless mailbox and public folder migrations from on-premises Exchange Server (2010, 2013, 2016, 2019) to Microsoft 365 (Office 365) or another live Exchange Server. The software eliminates the need for complex scripts or manual processes and provides a simple, intuitive interface to manage large-scale migrations efficiently.
Built with advanced features like parallel processing, automatic and manual mailbox mapping, and priority-based migration, Stellar Migrator for Exchange ensures high-speed, reliable, and organized data transfers. It supports migrations for all mailbox types, including primary mailboxes, archive mailboxes, and public folders—all while preserving data integrity and folder hierarchy.
Pros
- Performs direct mailbox and public folder migrations from Exchange to Exchange, Exchange to Office 365 & Vice Versa Migration
- Supports Exchange Server versions 2010, 2013, 2016, and 2019.
- Migrates user mailboxes, archive mailboxes, and public folders.
- Supports public folder migration to Office 365 or Exchange.
- Enables parallel mailbox migration for faster performance and reduced downtime.
- Allows priority-based migration, enabling critical mailboxes to be migrated first.
- Features automatic mailbox mapping with manual override for flexible control.
- Maintains original folder structure and mailbox hierarchy.
- Supports resumable migration in case of interruptions.
- Offers incremental migration to transfer only new or changed items.
- Provides an easy-to-use interface suitable for IT teams and administrators.
- Ideal for cutover, staged, or hybrid migration scenarios.
Cons
- The free version allows two-user migration.
The Systools Exchange to Office 365 Migration Tool helps Exchange administrators to migrate the mailboxes from on-premises Exchange server to Office 365 mailboxes. The software can migrate up to 200 mailboxes simultaneously to Office 365. However, this requires a high-end system with at least 8 cores and high bandwidth internet connection.
Image Source – SystoolThe software also features a built-in dashboard that displays the status of the migration process. It provides an option to map source and destination mailboxes for quick and easy migration. Further, it allows you to re-run the Exchange to Office 365 migration process if the mailbox export fails due to any reason.
Pros
- Migrates mailbox data from Exchange to Office 365
- Exports unlimited mailboxes to Office 365
- Option to map source and destination mailboxes
- Option to set mailbox export priority
- Facilitates selective mailbox migration
- Displays live export progress report
- Preserves folder hierarchy and structure
- Supports Exchange 2016, 2013, 2010, 2007
Cons
- The free version allows two-user migration. For unlimited mailbox migration, it requires activation
- Does not support Exchange 2019
Shoviv’s Office 365 migration tool allows administrators to migrate user mailboxes from Exchange EDB files to Office 365, Live Exchange, or PST format. Its intuitive and easy-to-use interface allows anyone to use the tool for Office 365 migration. It also facilitates Office 365 to Office 365 migration while maintaining the folder structure. It further provides an option to map source and destination mailboxes for accurate and precise migration.
Image Source – ShovivThe software also migrates Public Folder and Archive mailboxes to Office 365. It features a search option to help locate specific mailboxes for migration to Office 365. You can search and filter the results based on various criteria, such as Cc, Bcc, Date, Subject, Attachment date, etc.
Pros
- Migrates mailboxes from Exchange EDB to PST, Live Exchange, and Office 365
- Facilitates Office 365 to Office 365 migration
- It comes with an Incremental Export option to avoid duplicity
- Features auto-mapping and manual mapping options
- Advanced filter option to find and migrate specific mailboxes
- Exports mailboxes from multiple EDB files
- Retains original folder hierarchy and structure
- Supports Exchange 2003, 2007, 2010, 2013, 2016, 2019, and Office 365
Cons
- Demo version allows you to export or migrate 50 items/folder
- Requires activation to export unlimited mailboxes
- Slow migration as it does not support Parallel or Concurrent mailbox processing
Conclusion
Office 365 migration tool is a must-have tool for Exchange administrators looking for a solution to migrate mailboxes from on-premises Exchange to Office 365 without disrupting the user access. Exchange migration tools, such as Stellar Migrator for Exchange, helps migrate mailboxes from Exchange on-premises to another Live Exchange server, Office 365. In this post, we discussed the 3 best Office 365 migration tools that can help you migrate mailboxes and data from Exchange on-premises to Office 365 with 100% integrity and precision. These Office 365 migration tools help you quickly migrate the mailboxes and avoid downtime. You may choose any based on the features and your requirements.
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