IMAP to Office 365 Migration Tool

Why Use Regain for IMAP to Microsoft 365 Migration?

Review the migration controls and backup options available in the software.

Migration and Mailbox Backup in One Tool

Use the same application for IMAP-to-Microsoft 365 migration, transfers between supported IMAP accounts, and local mailbox backups. Depending on your destination, you can save email data in formats such as PST, EML, EMLX, MBOX, MSG, and PDF. Learn more about IMAP email migration to Microsoft 365.

Preview and Select Mailbox Folders

Preview the source mailbox before starting the transfer and select the folders you need. You can deselect folders such as Spam or Trash when they are not required. Where folder mapping is available in your selected migration workflow, use it to organize source folders in the destination mailbox.

A Guided Migration Workflow

The guided workflow brings source connection, mailbox preview, folder selection, destination sign-in, and migration options together in one application. Before starting, confirm that the source provider allows IMAP access and that the destination Microsoft 365 mailbox has sufficient storage and the required permissions.

Supported Email Services and Backup Formats

Move supported IMAP mailbox data to Microsoft 365 or save a local backup in a supported file format.

Browse IMAP Mailbox

Process Regain IMAP to Office 365 Migrator

Save Emails in Office 365 Mailbox

Email Clients/Servers: Office 365, Exchange On-Premises, Gmail, G-suite, Yahoo, Rediff! Mail, Zoho Mail, GoDaddy, Outlook/MSN/Hotmail, Hostinger, all IMAP Accounts.

File Formats: PST, MSG, HTML, EML, EMLX, MBOX, PDF and Several File Formats

How to Migrate IMAP Mailboxes to Office 365 in 3 Steps

Open the Regain IMAP to Office 365 Migrator Tool. Enter your source IMAP account credentials to log in.

Once logged in, preview the mailbox. Select the folders you want to migrate and choose your destination either a file format for backup or another IMAP account.

Choose the Mailbox Import-Migration, enter your destination account credentials (e.g., Office 365) for connection, and start the migration.

Step 1: Connect to the source IMAP mailbox

Step 2: Preview and select IMAP mailbox folders

Step 3: Choose Office 365 and start migration

Technical Specifications

Check the system requirements and supported Windows versions before installing the Regain IMAP migration software.

System Requirements

Processor - Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz 2.39GHz
Memory - 4 GB of RAM (4 GB is recommended)
Hard Disk - 500 MB for Software installation
Disk Space - Enough space to store recovered output

Version Supports

Windows OS Platforms - Windows 11/10/8.1/8/7/Vista
Windows Server - 2012/ 2008 R2/ 2008/ 2003 R2/ 2003
MS Outlook - 2021/ 2019/ 2016/ 2013/ 2010/ 2007 and 2003

Installation / Uninstallation

User's Guide Installation / Uninstallation EULA IMAP and Security Settings

IMAP to Office 365 Migration Tool Features

Explore the features that help you select, migrate, and back up IMAP mailbox data.

Universal IMAP support

An easy way to migrate emails from any IMAP-enabled email client or server — Google Workspace (Gmail), Yahoo, Zoho, Outlook.com, Yandex, and more, without mailbox size limits. You just need login credentials to connect with the source.

Various Backup Options

This utility also provides multiple file formats in which you can backup IMAP emails. Users can export emails to multiple file formats, including PST, PDF, MSG, EML, and MBOX. Choose the format that fits your workflow.

Direct IMAP-to-IMAP Migration

Easily transfer emails between IMAP accounts while preserving folder hierarchy and data structure. Just log in to source and destination accounts, no complex setup is needed. You can migrate emails from any IMAP account to another IMAP account .

Split Oversized PST Files

Set a size limit for PST backups to prevent file over sizing. We know that oversized PST files are prone to corruption; hence, we need to manage their size. The tool auto split PST files to stay under recommended limits (e.g., 50 GB by Microsoft); you just have to set the resultant PST file size.

Guaranteed Data Integrity

This IMAP to M365 Migrator utility properly preserves the data integrity and keeps all attributes intact. It retains folder structure, metadata, and email layout in both backup and migration.

Supports Office 365 & All Exchange Server Versions

Users can migrate IMAP mailbox data to Microsoft 365 using the supported sign-in workflow. Check the product documentation for the Exchange Server versions and authentication methods supported by your installation.

Folder Selection Facility

In most cases, users don’t want to migrate all folders and skip some folders like trash and spam. Users can preview account folders before exporting. Select or deselect specific folders to backup/ migrate only what you need.

Free Trial Available

Everyone wants to be satisfied with the purchase before spending any money, and Regain Software knows it. Users can download the IMAP to Office 365 Migration software and try it before purchasing the license. The demo version is just a restricted version of the full one with the same working.

Technical Support

With IMAP Emails to Office 365 Migrator, users also get free technical assistance. It comes with a user-friendly interface, but if you still need assistance, technical assistance is available through the support channels listed on the Regain Software website.

Supports All Windows OS

This Email Migration tool is compatible with all the versions of Windows operating systems. Doesn’t matter what version of the Windows OS you are using; it works flawlessly with all. E.g., Windows 7, Windows 8, Windows 10, Windows 11 pro and all.

Example: Migrating a Yahoo Mail Account to Microsoft 365

An example of using the tool for an IMAP mailbox transfer and a separate local backup.

Case: I am a Yahoo! Mail user planning to switch to Office 365. In addition to migrating my emails via IMAP, I also want to backup my existing Yahoo emails in MBOX format for future use. Can you help with both tasks? I would be grateful if I could do both tasks with the same license.

Solution we Provided Email migration between email clients/servers is common, and many users also require a backup of their current emails. To meet this need, we suggested Regain IMAP to Office 365 Migration Tool. With this utility, the client migrated from Yahoo! Mail to Office 365 and took backups in MBOX file formats efficiently and effortlessly.

Reviews

Explore the third-party listing and customer feedback available for this product.

Software Reviews

CNET Our product analysts tested the Regain IMAP to Office 365 Migration Tool and ranked it among the best IMAP migration solutions. During test, the tool completed the task quickly and flawlessly. View Details →

SoftwareSuggest Reviews for Regain IMAP emails to Microsoft 365 Migration Tool

Software Suggest The Regain IMAP to Microsoft 365 Migration Tool offers all essential features for efficient IMAP email migration and backup. It supports multiple file formats, including PST, PDF, MBOX, MSG, and more. Highly recommended for seamless IMAP backup/migration tasks. View Details →

Client Reviews

I had been using Gmail for years but needed to migrate to Microsoft 365. I choose the Regain IMAP to Office 365 Migrator, and it effortlessly transferred all my emails from Gmail to Office 365. I’m now using my Microsoft 365 account with full access to my old messages.

★★★★★

Woody Smith, USA

I am not a technical expert. The biggest problem I was facing was whether I could find such software with the help of which I could migrate my IMAP to Office 365, that too without any technical expertise, but with Regain IMAP to Office 365 Migrator solved my problem, due to this I did my work very easily, thank you Regain Software.

★★★★★

Luci Head, Sweden

I am really pleased with this professional utility that helped me with my Zoho Mail to Exchange Online migration. I must recommend this utility to all my known professionals. Very user-friendly interface.

★★★★★

Oliver S. Jonathan, South Africa

Submit Your Reviews

Free Demo vs. Full Version

The demo lets you evaluate the workflow with a limit of 10 items per folder. The licensed version removes this trial limit.

Software Features	Trial Version	Full Version
Import IMAP email account to Office 365 instantly	Save 10 items/Folder	✔
Backup IMAP Server Emails to Local Drive	Save 10 items/Folder	✔
Backup IMAP Emails to PST, MBOX, MSG, PDF, EML and multiple Files.	Save 10 items/Folder	✔
Migrate Emails from One IMAP Server to Another IMAP	Save 10 items/Folder	✔
Import IMAP Server emails to Gmail, Zoho Mail, Amazon Workmail and many more	Save 10 items/Folder	✔
Migrate or Backup Selected Folders	✔	✔
24x7 Technical Support	✔	✔
Saving Capabilities	Save 10 items/Folder	No Limitation
	Download	Buy Now

Frequently Asked Questions

Answers to common questions about migrating IMAP emails to Office 365 (Microsoft 365).

How do I migrate emails from an IMAP account to Office 365?

Use these steps to migrate your IMAP mailbox to Microsoft 365:

Install and open Regain IMAP to Office 365 Migration Tool.
Enter the source email address, password or supported sign-in method, and the IMAP server details.
Connect to the source account and preview the mailbox folders.
Select Mailbox Import-Migration and choose Office 365 as the destination.
Sign in to the destination Microsoft 365 account and configure the available migration options.
Start the migration and review the completion details.

Can I migrate Gmail, Yahoo Mail, or Zoho Mail to Office 365?

Yes. The tool can connect to Gmail, Yahoo Mail, Zoho Mail, Outlook.com, AOL, Yandex, and other IMAP-enabled services. The source account must have IMAP access enabled, and you must use the authentication method required by that email provider.

Does the tool support Microsoft 365 sign-in with MFA?

The product supports Modern Authentication (OAuth 2.0) and Multi-Factor Authentication (MFA) for supported Microsoft 365 sign-in workflows. The exact sign-in options available can depend on your Microsoft 365 tenant settings and the permissions granted to the account.

Do I need to enable IMAP before migrating my source mailbox?

Yes. IMAP access must be enabled for the source mailbox, and you need the correct IMAP server name, port, encryption setting, and valid credentials. Some providers require an app password or OAuth-based sign-in instead of the regular account password.

Can I migrate only selected folders instead of the entire mailbox?

Yes. Preview the source mailbox and select the folders you want to transfer. You can deselect folders such as Spam or Trash when you do not need them in the destination mailbox.

Will the folder structure and email attachments be preserved?

The software is designed to retain the mailbox folder hierarchy and email content during migration, including supported message properties and attachments. The final result can also depend on destination-service restrictions and how the source provider exposes particular message data through IMAP.

Will migrating emails delete or change messages in my source IMAP account?

The migration workflow copies selected mailbox data to the destination; it is not intended to delete the original source messages. Keep your source account available until you have checked the migrated mailbox and confirmed that the required data is present.

Can I back up IMAP emails to PST, MBOX, EML, MSG, or PDF?

Yes. In addition to cloud migration, the software provides local export options including PST, MBOX, EML, EMLX, MSG, and PDF. Choose the required output format in the application before starting the export.

Can I migrate emails between two IMAP accounts with this software?

Yes. The tool also supports IMAP-to-IMAP migration, allowing you to transfer mailbox data between supported IMAP-enabled accounts.

Do I need Microsoft 365 administrator credentials?

For a single mailbox, an account with the required access and permissions may be sufficient. For organization-wide or multiple-mailbox projects, an administrator may need to configure permissions and authorize access according to the Microsoft 365 tenant's policies.

What should I check before starting an IMAP-to-Microsoft 365 migration?

Confirm that IMAP is enabled on the source account, the server settings and credentials are correct, the destination mailbox exists, and it has enough available storage. Also check Microsoft 365 permissions, authentication requirements, mailbox quotas, and any provider-specific transfer limits.

Is there a free trial of the IMAP to Office 365 Migration Tool?

Yes. The demo version lets you evaluate the software and migrate up to 10 items per folder. Purchase and activate a license to use the full version without this trial item limit.

How long does IMAP to Office 365 migration take?

Migration time varies with the number and size of emails, source-provider response, internet connection, Microsoft 365 throttling, and the number of folders. A small mailbox may finish sooner than a large mailbox with many attachments.

Can I use my computer while the migration is running?

You can generally use your computer for other tasks while the migration runs. Avoid closing the application, disconnecting the network, or shutting down the computer until the process has finished.

IMAP to Office 365 Migration Tool

Why Use Regain for IMAP to Microsoft 365 Migration?

Supported Email Services and Backup Formats