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How to Migrate IMAP to Office 365? – Read This Guide

Justin Cener ~ Modified: March 6th, 2023 ~ Migration ~ 6 Minutes Reading

In this technical write up, we discuss how to migrate IMAP to Office 365. We are going to share proper guidance and various solutions on IMAP to Office 365 migration. In the solutions, there are both a manual method as well as an automated solution. So, carry on reading this article till the end to accomplish the task.

Microsoft provides a productivity suite for users named Office 365. It is a robust cloud-based service consisting of various applications that alleviate and increase the productivity of a business or an organization. It comes in subscription based plans based on the requirements and size of an organization. Moreover, Office 365 is loaded with enhanced and ungraded security features; which is why many organizations and businesses are looking to migrate IMAP to Office 365.

On the other hand, IMAP (Internet Message Access Protocol) is the most authoritative internet protocol used by several email clients for receiving emails from email server via a TCP/IP connection. However, with the upgraded security and features of Office 365 are making users migrate email from imap to office 365.

Furthemore, in this article, we have shared the top two methods applied by most users. One is a manual method whereas the other one is an expert-recommended method. So without any further ado, let’s get started with IMAP to Office 365 migration.

Manual Approach to Migrate IMAP to Office 365 Migration

This manual operation is divided into six major stages which have further sub-steps in them. Do note that it is highly recommended that you perform every step carefully with precision. Otherwise, you may struggle with data corruption or worse, data loss. However, before moving any further, there are a few pointers that you need to note and be aware of. They are listed as follows.

Key Limitations of the Manual Migration

Here are the limitations and drawbacks of the manual procedure, as per the Microsoft Support Page. Before diving into the procedure, do read and understand these with attention.

  • Microsoft’s in-built data migration tool is unaware of enforcing MRM (Messaging Records Management). Due to this, the deleted and archived messages are flagged as “missing” items by the migration process. Although this is perceived data loss rather than actual data loss. However, this makes it harder to identify actual data loss.
  • This type of migration does not migrate your calendar items, contacts or tasks. Only the items in a user’s inbox or other mail folders can be migrated.
  • Moreover, the maximum number of items that you can migrate from a user’s mailbox is 5,00,000. The emails are migrated in the order of newest to oldest.
  • In addition to that, the biggest email size you can migrate is 35 MB.
  • To migrate IMAP mailboxes, you will have to create users in Office 365 first.

So these are the limitations that you need to go through first in order to understand the hindrances of the manual procedure. Now that we have mentioned these, let’s move on to the IMAP to Office 365 migration process.

Steps to Manually Migrate to Office 365

Here are the major steps for a manual IMAP to Office 365 migration process. Below we have shared the steps to take in order to accomplish the task

  1. Identify the full name of your current email server
  2. Create a list of mailboxes to migrate them
  3. Connect Office 365 with your email system
  4. Create a migration batch and migrate mailboxes
  5. Route emails directly to Office 365
  6. Discontinue email synchronization

These are the major steps which have further sub-steps to execute the procedure. However we only shared the major steps as it is a lengthy and tiring process. So, to save your time and energy we have brought an expert-recommendation in the next segment.

Migrate IMAP to Office 365 with a Professional Solution

Avoid the struggle of missing vital data items or the fear of facing data loss due to following manual procedure for IMAP to office 365 migration. Choose the expert suggested Corbett IMAP Migration Tool for a successful and reliable result. Not only does this software securely executes the whole migration process but it also migrates directly from your IMAP account.

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Steps to use the Software to Migrate IMAP to Office 365

  1. Download and launch the software on your computer or laptop and click on the Open button in the software window
    click on the open button to migrate IMAP to Office 365
  2. In the displayed menu, click Email Accounts >> Add Account
    add your IMAP account to migrate IMAP to Office 365
  3. Enter your IMAP account credentials to add your account to the software
    enter your IMAP account credentials
  4. Now, you will see all your account data in the software. You can click on a specific email to view its elements in the preview panel
    preview any email message
  5. Use the Quick Search & Advanced Search Settings to filter through your data on a more granular level
    use the quick and advanced search settings
  6. Then, click on the Export button and choose the Office 365 from the dropdown menu
    export IMAP to Office 365
  7. Before proceeding any further, apply the Advanced Options as per your requirements
    apply the advanced options
  8. Next, enter your Office 365 account credentials
    enter your office 365 credentials
  9. Finally, click on the Save button
    click on the save button

As you see in just a few simple steps, you can easily and securely migrate IMAP to Office 365. Furthermore, there are several reasons why this software is the choice of numerous experts.

Why Experts Recommend Choosing this Migration Software?

  • Execute IMAP to Office 365 migration smoothly with full security.
  • Is also capable of converting your IMAP data to multiple file formats and document formats.
  • Provides the option for users to perform selective IMAP migration.
  • Option to Include or Exclude specific folders for a clear folder structure.
  • Automatically detects email addresses with its advanced settings.
  • Also includes email header during IMAP to Office 365 migration process.

All these features contribute to the functionality and advancement of this tool making it the best choice for users looking to migrate IMAP to Office 365. These are rare to find in every other IMAP migrator.


In this above-mentioned blog, we talked about various solutions regarding IMAP to Office 365 migration. We shared both a manual method as well as an automated tool. However, the manual procedure has some limitations that cannot be ignored to ensure data safety. Hence, technical experts recommend users to go for a professional software to migrate IMAP to Office 365.

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