Quick Guide to Migrate Emails From Office 365 to Zoho Mail on Mac

Written By Suman Rawat
Updated on July 13th, 2026

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User Query: Our company currently uses Microsoft 365 for email, but we’re moving to Zoho Mail as part of our Zoho One setup. We need to migrate all user mailboxes, including emails, contacts, calendars, and attachments, without losing data or causing downtime. What’s the best way to migrate Office 365 to Zoho Mail on a Mac?

Summary: Some people are moving from Office 365 to Zoho Mail because they already use Zoho for other work tools. Keep all the emails in one place feels easier for them. The migration part can feel a bit tricky, especially when you have old emails to move. In this guide, I’ll show simple ways to migrate emails from Office 365 to Zoho Mail on a Mac, including using a MacGater Office 365 Mailbox Backup tool.

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Table of Contents

Real User Scenario

“We use Microsoft 365 for emails and Zoho One for CRM, Campaigns, and other business apps. Our management wants to Office 365 to Zoho Migration, but I’m not sure if it’s the right decision or how to migrate without losing data.”

This is a common situation for businesses that already use Zoho products. Keeping email on the same platform can make user management easier and reduce the need to switch between different services. Before you start the migration, check your mailbox size and other data you want to move. A little planning helps avoid problems & keeps your emails, contacts, & folders safe during the migration.

Manual Methods to Migrate Emails from Office 365 to Zoho Mail

Follow the given manual methods to accomplish the migration of your Office data to Zoho Mail.

Method 01: Switch from Office 365 to Zoho via Zoho One-Click Migration

In this method, Zoho provides a built-in migration option for Microsoft 365 users. It securely transfers mailbox data through Microsoft authentication without the manual export of mailbox files.

Sign in to the Zoho Mail Admin Console through administrator account credentials securely today.
Open the Data Migration section and choose Microsoft 365 as your migration source platform.
Authorize Microsoft 365 via OAuth and grant required mailbox migration permissions for secure access.
Add user accounts manually or import users through a CSV file before migration.
Map source mailboxes with Zoho Mail accounts and verify every user assignment carefully.
Start the migration process & monitor progress.

Method 2: Migrate Emails from Office 365 to Zoho Mail via IMAP Migration

IMAP migration is a manual option to transfer your emails from Office 365 to Zoho Mail. It moves email folders while keeping your original mailbox structure unchanged.

Enable IMAP access for all Microsoft 365 mailboxes before you start the migration process successfully.
Sign in to Zoho Mail Admin Console >> open the Data Migration section.
Select IMAP Migration and enter Microsoft 365 server details with administrator account credentials carefully.
Add user mailboxes manually or upload a CSV file for multiple account migrations.
Map Microsoft 365 mailboxes with Zoho Mail users and verify all account information correctly.
Start the migration and monitor completion until every email transfers without unexpected migration errors.

Limitations of Manual Methods

It requires administrator access to both Microsoft 365 & Zoho Mail accounts.
The setup process can be difficult for users without technical experience.
Incorrect configuration may cause migration failures or incomplete mailbox transfers.
Bulk mailbox migration requires additional setup, user mapping, and careful monitoring.
Some mailbox settings, rules, or permissions may need manual reconfiguration after migration.
Every migrated mailbox should be checked manually to confirm all data transferred successfully.

Professional Method to Migrate Emails from Office 365 to Zoho Mail

You can use the Office 365 Mailbox Backup Tool to move your data directly into Zoho. It lets you migrate multiple accounts in one process. This software works without any interruption from accessing your mailbox at the time of migration. It uses Microsoft sign-in for account authentication. The same software let you export Office 365 contacts to iCloud.

Simple Steps to Transfer Emails from Office 365 to Zoho Mail

Start the Office 365 Mailbox Backup Tool & choose the Backup option.
Enter your Office 365 email address >> sign in to your account.
Select the required user ID and mailbox,>> click Next to continue.
Pick the folders you want from the list shown on the screen and proceed.
Choose IMAP as the saving option & enter your Zoho Mail details.
Sign in to Zoho Mail, set the needed filters, & start the process.

Conclusion

To wrap it up, you can migrate from Office 365 to Zoho Mail via manual methods or a professional tool. While the manual method works for small setups, but need time and effort. On the other hand, a professional Office 365 Backup and Restore Tool makes the whole process easier. It is suggested to check your data after migration to make sure everything has moved correctly without any loss.

Frequently Asked Questions

Q1. How do I migrate 100+ Office 365 users to Zoho Mail?

Ans. You can migrate 100+ users using Zoho’s admin migration tool or IMAP bulk migration. Upload a CSV file with user details, map mailboxes, and start the process. It is better to run migration in batches to avoid errors and reduce server load.

Q2. Why is Zoho showing “Invalid User Details” during migration?

Ans. This error usually appears when login credentials are wrong or IMAP is not enabled in Microsoft 365. It can also happen if two-factor authentication is blocking access. Double-check username, password, and server settings before trying again.

Q3. Can I migrate Office 365 contacts and calendars along with emails?

Ans. Yes, but only if you use Zoho’s full migration or admin migration tool. IMAP migration usually moves only emails. For contacts and calendars, you need to select additional migration options or use a tool that supports full mailbox data transfer.

Q4. Is there a way to exclude duplicate emails during the Office 365 to Zoho Mail migration?

Ans. Yes, some migration tools and Zoho settings allow duplicate email filtering. This helps avoid copying the same emails again during migration. However, manual IMAP migration does not always remove duplicates automatically, so extra checks may be needed.

Q5. How can organizations minimize downtime during Office 365 email migration?

Ans. To reduce downtime, run migration in batches and use incremental sync. Keep both systems active during the transition. Start migration before final cutover so users can continue working while data syncs in the background.

Q6. Is it possible to migrate shared mailboxes from Office 365 to Zoho Mail?

Ans. Yes, shared mailboxes can be migrated using Zoho admin migration tools. You need to map shared accounts separately during setup. After migration, permissions and sharing settings may need to be configured again inside Zoho Mail.

About The Author:

Suman Rawat

Suman Rawat is a technical content writer and expert in the fields of email migration, data recovery, and email backup. Her passion for helping people has led her to resolve many user queries related to data conversion and cloud backup.