Safest Way for Exchange On-Premise to Office 365 Migration

Summary: In this article, we will be helping the users by explaining the Exchange On-Premise to Office 365 Migration process(automated) and some migration types of exchange servers that can be used while moving exchange data.

Every small, medium-size firms and enterprises are always on the lookout for ways to make their business more successful and scalable. While some organizations still use the old norms when it comes to technology.

When industry standards started to change. The companies realized that they must shift to the latest technology if they want to grow with the other businesses. It has been proven that shifting to the cloud platform saves companies costs as they don’t have to maintain the servers. In addition, users can scale their services as per the organization’s needs.

Different Migration Methods of Exchange Server

In this section, we will talk about the different migration techniques which can help users to implement the exchange server to Office 365 migration process and users can decide which method is suitable to conduct a safe migration.

  1. Staged Migration

For Exchange server versions (2003-2007), Staged Migration is the only Microsoft-supported migration method to O365. With this Office 365 migration type, users can simply move the entire email mailbox in batches. This method is capable to migrate more than 2000 mailboxes.

The user must sync their accounts between the on-premises Active Directory domain and Microsoft/Office 365 using Azure Active Directory sync.

It Allows to move only user mailboxes and resource mailboxes. Other recipient types, such as distribution groups, contacts, and mail-enabled users need to migrate manually.

  1. Cutover Migration

A cutover migration is used for the exchange server to Office 365 migration. With the help of this migration technique, users can move all the mailboxes to Office 365 at once. But there are some conditions related to the method that users should take care of in advance.

You can migrate up to 2000 mailboxes using a cutover migration, but we suggest to go for only 150 mailboxes in a migration batch.

  • The method is available for the Exchange Server 2003 and higher versions.
  • In Office 365, the user should own the domain name, which is used as the source domain name in on-premises Exchange. And have licenses for all the user mailboxes migrated to Office 365.

After following all conditions, the user can begin the exchange on-premise to Office 365 migration task.

  1. Staged Migration

This migration option is suitable for the on-premises Exchange Server 2003 and 2007. It is similar to a cutover migration, but it uses a CSV file to include the number of mailboxes to migrate.

  1. Hybrid Migration

This is another technique to execute the exchange on-premise to Office 365 migration task. The Office 365 hybrid migration allows users to establish a link between Office 365 and Exchange servers and existing directory services. As a result, you can synchronize and manage user accounts for both accounts easily.

Also, they can pick and decide which mailbox need to migrate and which needs to be kept in the exchange server. Moreover, users can introduce a single sign-on with the same password for both accounts to make it easier for users to log in to both platforms.

To use the hybrid migration type, users must have more than 2,000 mailboxes. And should have Exchange 2010 or later version server.

  1. IMAP Migration

An IMAP (Internet Message Access Protocol) migration enables users to move their mailboxes from Gmail or any other email client that supports IMAP migration. IMAP migration has a limit of 50,000 total mailboxes and 5,000,000 items. And once the exchange on-premise to Office 365 migration process is complete, the user won’t be able to migrate the newly arrived mail-in source account.

An IMAP migration retrieves the source mailbox data and passes it to Office 365. However, use this migration type to move only email data. As IMAP does not allow items like Calendar, task and contacts to migrate, the user has to manually transfer those items.

Note – Depending upon the size of mailbox data, the user had to take a decision to choose the best one from the given types for exchange server to Office 365 migration. Or else users can look for a professional tool which can help them in On-premise migration.

Limitations of Conventional Migration 

The manual methods are associated with some limitations which are:

  • The user must be a technical expert to complete the migration process.
  • User may cause a lot of errors, If user skips any single step during Exchange migration process.
  • All these procedures are difficult for novice users to perform without technical assistance.
  • Its a lengthy & time-taking which might take several hours or days.

One-Stop Solution for On-Premises Migration in a Safer Way    

In this section, we will explain the professional solution to help the user with On-premises migration. By using the Most Advanced Exchange to Office 365 Migration Tool.

Follow the tool steps to complete the process of exchange migration.

  • Download and run the migration tool to initiate the exchange on-premise to Office 365 migration task. Then, press the Exchange and Office 365 as the source and target platform.

  • On the same window (Setup), choose the categories that the user wants to include for migration. Also, set the date filters if the user needs them. Now, click on Next.

  • Type the Exchange server login credentials. And hit on the ‘Validate’ button for validation.

  • In the destination tab, fill the office 365 login details. Now validate and hit on Next button.

  • Under the user tab, choose any option Fetch Users, Import Users and Download Template to add users from the source account.

  • Now user requires to import a group mapping file to create a mapping between the source and target domain groups.

  • After the mapping process completes, the user can see the list in which both the source and destination email address is present. No press the validate button.

  • Finally, after validation gets successful. Hit on the Start migration button to begin the exchange server to Office 365 migration process.


Setting up an exchange server and maintaining it can be a big challenge for some organizations. And shifting to Office 365 can be the best idea to scale up the business productivity. And to make that happen users need to perform the Exchange On-Premise to Office 365 Migration process. Moreover, in this article, we have discussed some migration types and explained a one-click solution to complete the entire migration process.


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