Migrate from Roundcube to Office 365: Quick Solution
User Query: My company is transferring to Office 365, and we need to transfer all our emails from Roundcube. What is the safest way to migrate from Roundcube to Office 365 without losing important business data?
Summary: Email plays a significant role in daily business communication. Many organizations started their email journey with Roundcube because it is free, open-source, and easy to use. However, as businesses grow, they often need better security, more storage, and advanced collaboration tools. Microsoft Office 365 (now Microsoft 365) offers all these features on a single platform. That is why many users and companies decide to migrate Roundcube to Office 365. In this blog, we will explain the manual method and a professional DRS IMAP Email Backup Tool for a hassle-free solution.
Why Transfer Emails from Roundcube to Office 365?
Many users choose Office 365 over Roundcube for better performance and reliability. Some of the other reasons are:
- Office 365 offers spam filtering, malware protection, and data loss prevention.
- Roundcube depends on server limits, while Office 365 provides large mailboxes.
- Office 365 allows users to share files, schedule meetings, and chat in one place.
- Microsoft manages updates and maintenance, which reduces manual work.
- Also, emails and files can be accessed from desktop, mobile, or web.
Manual Method to Migrate from Roundcube to Office 365
Manual migration is one of the basic ways to move emails from Roundcube to Office 365. This method does not require any third-party software, but it does need time, patience, and technical understanding. It is mostly used by individuals or very small teams with limited email data.
How Manual Migration Works
In manual migration, emails are transferred using an email client such as Outlook, Thunderbird, or any other IMAP-supported application. Both the Roundcube account and the Office 365 account are connected to the same email client, which allows emails to be copied manually.
Step-by-Step Process
Step 01: Set Up Office 365 User Accounts
Before starting the migration, Office 365 mailboxes must be created for all users. Each user should have an active license and login credentials. Make sure you can access the mailbox through Outlook or webmail to confirm it is working properly.
Step 02: Configure Roundcube Email in an Email Client
Roundcube itself does not export emails, so an email client is needed. Use the IMAP settings provided by your hosting provider and add the Roundcube account to the email client. Once configured, all folders such as Inbox, Sent, Drafts, and custom folders will appear.
Step 03: Add Office 365 Account to the Same Email Client
Next, add the Office 365 account to the same email client. This usually requires the user’s email address and password. After setup, Office 365 folders will appear alongside the Roundcube folders.
Step 04: Drag and Drop Emails Folder by Folder
Now comes the actual migration part. Select emails or folders from the Roundcube account and drag them into the corresponding Office 365 folders. This process must be repeated for each folder until all required emails are copied.
Limitations of Manual Email Migration from RoundCube Webmail to Office 365:
- Manual migration works only when the mailbox size is small. Large mailboxes can take hours or even days to migrate.
- Emails can be skipped, duplicated, or accidentally deleted during the drag-and-drop process.
- There is no automated verification to confirm that all emails have been moved successfully.
- Each mailbox must be migrated one by one, which is not practical for multiple users.
- Moreover, businesses with important data, multiple users, or strict timelines should avoid this method due to the risk involved.
Professional Tool to Migrate from Roundcube to Office 365
To avoid all the limitations of the manual method, you can use the reliable DRS IMAP Email Backup Tool. This tool allows you to migrate several IMAP emails at once with no data loss. Preserves the original data formatting, structure, metadata, and more. With its simple interface, every user can easily use it without needing any technical skills. Moreover, you can migrate IMAP to Office 365 and other formats, including file formats and email clients.
This tool offers several advanced features, such as Preview, Remove Duplicate, Date Filter, etc. A free version of this tool is available to evaluate its features and functions. Moreover, this tool is highly compatible with all Windows versions, including Win 11 and more.
Simple Steps to Move Emails Roundcube to Office 365 Account
- Download and install the DRS IMAP Email Backup Software.
- Enter your IMAP Email Address & Password to Sign In.
- Preview and select the IMAP emails to migrate. Hit Next.
- Then, choose Office 365 as the Saving Format from the list.
- Write your Office 365 credentials, such as ID & Password, to Sign In.
- Apply advanced features and filters as per your needs. Click Convert.




Real-Life Scenario:
A small company was using Roundcube email provided by their web hosting service for daily communication. As the team grew and remote work increased, managing emails became difficult due to storage limits and security concerns. To improve collaboration and ensure data safety, the company decided to use a DRS IMAP Backup Tool to transfer all Roundcube emails to Office 365 quickly and without losing important business messages.
Conclusion
In this technical blog post, we explored several methods to migrate from Roundcube to Office 365. The manual method is free to use and works only when you need to migrate a small number of emails. Also, it has several limitations that make it an irrelevant choice for many users. Therefore, we highly recommend using a professional tool. It supports bulk migration with several advanced features. In addition, the migration process ensures that no data is lost.
About The Author:
I, Aaradhya Jain, a technical content writer at DRS Solutions, specializes in delivering clear, practical guides on data management, migration, and recovery tools. With a detail-oriented and user-first approach mindset, I transform complex processes into actionable insights for IT professionals and decision-makers.