How to Migrate from AppRiver to Office 365 Mac? Simple Tutorial

Written By
Shivansh Shukla

Updated on
June 26th, 2026

5 minutes Read
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Summary: Email migrations have become a common scenario for businesses. AppRiver users, especially those using Secure Hosted Exchange or Secure Cloud Mail, consider upgrading to M365 for improved integrations, increased flexibility with storage, and centralized admin controls. However, on a Mac system, it can sometimes be difficult to migrate from AppRiver to Office 365. This simple guide will assist you through a few reliable migration strategies, including both manual ways and an automated IMAP Email Backup Tool. The latter will ensure that emails, folders, and attachments transfer successfully and safely, with no downtime.

Why Users Migrate AppRiver Mailbox to Office 365 Reddit?

The most common reasons organizations migrate their work email solutions are:
  • Office 365 offers native integrations to Teams, SharePoint, OneDrive, Power BI, Outlook, and Azure AD.
  • Centralized regulatory compliance improves email governance and auditing capabilities.
  • Increased mailbox storage space with easy scalability.
  • Much better device synchronization across macOS, iOS, Windows, and mobile platforms.
  • IT teams want a standardized operating environment that supports hybrid cloud configurations.

Example Case: A company using multiple AppRiver mailboxes wants to provide unified collaboration through Microsoft Teams and SharePoint. Migrating to Office 365 provides these tools and allows the organization to combine them within a single ecosystem, reducing application switching and IT overhead.

Suggested Read: Migrate Qmail Emails to Office 365

Accurate Methods to Migrate from AppRiver to Office 365

Since AppRiver also provides cloud-based services, the migration becomes quite difficult. Moving from one cloud to another requires careful and precise steps. Here, learn two different methods for AppRiver to Office 365 migration with step-by-step instructions. These are briefly defined in the upcoming part of this section.

Method 1: Move AppRiver Emails to Microsoft 365 via Outlook

To use this method, ensure you have IMAP enabled in IMAP, admin credentials of your accounts, and installed Outlook for Mac. Once you have all, follow these steps:
  1. Start Outlook for Mac and configure your AppRiver account in it.
  2. Use the following credentials:
    • Incoming: imap.appriver.com (Port 993 and SSL)
    • Outgoing: smtp.appriver.com (Port 465/587 and SSL/TLS)
  3. Furthermore, similarly configure your Office 365 account.
  4. Use the credentials outlook.office365.com and tap Add Account to set up.
  5. Once done, Outlook for Mac will display their folders in the index on the left.
  6. Later, from the AppRiver mail folders, select the emails to migrate.
  7. After that, create a new folder in the Office 365 folders to move from AppRiver to Office 365.
  8. At last, drag the emails from AppRiver and drop them into the O365 new folder.

Method 2: Migrate from AppRiver to Office 365 by Expert Tool

MacSonik IMAP Backup Tool is a top-notch solution whether you have a few emails or bulk mailboxes. It allows for a secure and complete migration, including the email attachments and labels, etc., while keeping data and structure intact. Additionally, the advanced software ensures that any techie and non-techie can use it firmly and directly transfer emails from AppRiver to Office 365. Moreover, it offers some exceptional filters and features that streamline, simplify, and scale with zero loss.

Steps to Migrate AppRiver Mailbox to Office 365

  1. Begin with the installation and launch of the MacSonik IMAP Backup Tool.
  2. Then, enter the credentials for your AppRiver Mailbox and log in.
  3. Further, select the email folders from the tree structure. Tap Next.
  4. After that, choose Office 365 from the saving options and log in with your account.
  5. Finally, use the filters provided by the software and click Start Process to migrate.
Also Read: Migrate cPanel Email to Zoho Mail The tool automatically manages everything and instantly completes the migration in the minimal possible time. Also, it has a Demo Version for performance evaluation and a few free transfers. Besides this, it overcomes the following manual limitations when you move from AppRiver to Office 365:
  • Drag and drop generally doesn’t work with large folders, which are managed here with direct transfers.
  • Attachments do not sync on unstable networks, and formatting often breaks. This is handled easily by the tool with preservation.
  • The process is very slow, and there is no data security or formatting option. The versatile IMAP Backup Software ensures secure OAuth Authentication with multiple filters.

Conclusion

It can be pretty straightforward to migrate from AppRiver to Office 365 if you use the right method. For small mailboxes, manual transfer via IMAP works fine. But to successfully migrate large mailboxes, accurately and efficiently. A dedicated IMAP Migration Tool is best as it facilitates streamlined migration of emails, attachments, and folder structures. With the right workflow in place, the change to the Microsoft 365 realm is faster, safer, and disruption-free.

Also Read: Migrate DreamHost Email to Gmail

Frequently Asked Questions

Q1. What are the major factors to transfer emails from AppRiver to Office 365?

Ans: The common reasons are: 1. After the merger of AppRiver with ZixCorp, its billing has become too complex and inconvenient with plans. 2. No support is provided by AppRiver as compared to Office 365.

Q2. How long does it take to move AppRiver emails to Microsoft 365?

Ans: With the manual method, the process takes from hours to days or more. Whereas the MacSonik IMAP Migration Tool completes the export in some time with precision.

About The Author:

Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.

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