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How to Migrate Greatmail to Office 365 Mailbox?
Written By
Aarti Chauhan
Updated On
August 04, 2025
Read time: 6 minutes
Greatmail is a US based email service provider known for its email and SMTP hosting among other services. It provides cost-effective email hosting that is widely compatible with webmail clients, such as Gmail, Outlook, etc. Even though Greatmail provides a great scalability and security, businesses are switching towards Office 365. This is probably because of the cloud-based suite, co-authoring, document sharing, and other advanced features that Microsoft provides.
If you’re one of the businesses planning to migrate emails from Greatmail to Office 365, this is the article you should refer to. It will guide you through the hand-picked practices to make an easy transition.
Office 365 is becoming the preferred collaboration platform for organizations around the world for the following reasons:
Office 365 is integrated with a wider suite of apps that support enhanced productivity. It provides easy access to components like Word, Excel, OneDrive, Exchange Online, SharePoint, and even more. All these together will help you make your operations easier.
With Greatmail emails to O365, you get access to diverse mailboxes, which include primary user mailboxes, shared, and archive mailboxes, along with the Office 365 groups. This diversity is easily manageable through IMAP migration, which allows smooth integration between your existing Greatmail mailboxes and Office 365.
Another remarkable advantage of using Office 365 is the enhanced threat protection and security it offers. Office 365 involves security measures like data loss prevention and multi-factor authentication to keep your data secure.
When it comes to scaling and business expansion, Office 365 is the most suitable choice. With just a simple subscription upgrade, you can scale your business to accommodate the growing users and resources needs.
Microsoft 365 provides in-built backup and recovery facilities to protect your business data. It runs automated and regular backups on the tenant data every 12 hours, supporting a retention period of 14 days.
Since Office 365 is a cloud-based productivity suite, you can access it on any device and from anywhere just with an internet connection. This helps to promote the remote work culture, boosting the productivity and flexibility to work.
Here is a checklist that you can follow to avoid experiencing errors during the migration process.
Carefully perform the following list of tasks before starting the Greatmail to O365 mailbox migration process:
After preparing, follow the steps below to migrate emails from Greatmail to Office 365:
There are a few tasks that you need to perform after migrating to avoid conflicts and errors in accessing the Office 365 environment:
Follow the given stepwise procedure to migrate Greatmail Emails to O365:
Step 1: Create new accounts within the Office 365 tenant to accommodate the users you’ll be migrating from Greatmail.
Step 2: Provide the users with the relevant Office 365 licenses and login to the Office 365 admin center.
Step 3: In the admin center, follow the process to add the Greatmail domain to access the mailboxes.
Step 4: Set up Greatmail account in Outlook and use the IMAP server settings to access the information about the server.
Step 5: Now, generate a CSV file with the email ID and passwords mentioned of all the users in the Greatmail and then specify the Office 365 admin center credentials.
Step 6: Create migration endpoint in the Exchange admin center to establish connection between Office 365 and Greatmail IMAP server.
Step 7: Manage migration batches and then start the Greatmail to O365 mailbox migration process.
Step 8: Update the DNS records to forward all the emails to Office 365 mailbox.
Step 9: Open EAC and then remove the migration batches after the process completion.
Here are some limitations that make this process not feasible for migrating the mailboxes:
Migrating Greatmail mailboxes with the manual method includes complex and technical process, which often causes significant data loss. Therefore, the best way to migrate emails to Office 365 is by using a professional tool like Kernel IMAP to Office 365. The tool allows you to migrate emails from IMAP server-based mailboxes to Office 365 with just a few clicks. Some of the prominent features of the IMAP to Office 365 migration tool include:
Use the tool to make an efficient transition from Greatmail to Office 365 even if you don’t have technical expertise. The tool has a user-friendly interface and works with all major Windows OS versions.
With this detailed guide to migrate emails from Greatmail to Office 365, you can expect a swift and secured migration. You can use the manual methods, but they require in-depth knowledge of Greatmail and Office 365. Consider a professional IMAP to Office 365 migration tool like Kernel IMAP to Office 365 migration solution. The tool allows selective migration of emails and supports more than 20+ IMAP servers for migration. It features a simple and user-friendly interface, which makes it easy for all users to execute the data transfer. Take the free trial today to know more.
