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Written By
Simran Bhatia -
Approved By
Sonika Rawat -
Updated on
November 4th, 2026 -
Read Time
8 minutes
User Query: “We are going to switch from Canary Mail to Office 365 next month, but this product does not provide any export options. Some of the mailboxes have 20,000+ items with attachments that need to be transferred. How can we migrate all mailboxes directly to Office 365 without any data loss?”
Introduction: Canary Mail is a privacy-focused email client that connects to IMAP accounts. Yet it offers no native option to migrate Canary Mail to Office 365. Migrating with native or manual approaches may lead to several issues such as missing folders, attachment loss, etc. Therefore, IT teams need a reliable, controlled method for their bulk migrations. This guide covers the manual approach and the SysInfo IMAP Migration Tool for secure, folder-preserving transfers.
As Canary Mail is an email client, the migration process only involves the transfer of mailbox data from the corresponding IMAP account to Exchange Online. Companies choose to migrate because it allows full control and provides built-in backend integration. In addition, Microsoft 365 has several benefits, making it reliable for enterprises. The key reasons are provided below.
Canary Mail is an email client, not a hosting service. It synchronizes with the user’s existing email services (Gmail, Outlook, or their preferred IMAP account). Therefore, the mailbox history remains on the provider’s side. Therefore, a Microsoft 365 migration tool ought to target the backend server, not the client application.
IMAP migration carries over emails, folders, attachments, timestamps, and read/unread states. Yet it moves only email data. Therefore, contacts, calendars, tasks, mailbox rules, and signatures cannot move through this process. Instead, administrators should migrate these items separately during the cutover phase.
The main disadvantage of using the Canary Mail solution is that it does not provide the option to directly export the mailbox to Office 365. The workaround for this is to save the messages as EML files, then convert EML to MBOX, create a PST with these messages, and then import this file into the Office 365 mailbox using the Outlook application. This option is only recommended for migrating a few mailboxes.
These are some of the limitations you may face when you migrate Canary Mail to Office 365:
For enterprise environments, an automated professional utility automates bulk tasks, which reduces manual effort. The IMAP Backup Tool connects directly to the IMAP account configured in Canary Mail and migrates its folders into Office 365/Outlook. Moreover, it offers Single and Batch CSV modes, mailbox mapping, and advanced filters such as deduplication, date range filter, etc. This tool is specialized for enterprise tasks, which makes it more reliable and secure.
This tool provides a complete report that summarizes processed, skipped, and failed items. You can evaluate its features using the demo version by following its Software guide.
Supported Source and Destination |
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Category |
Supported Options |
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Source |
IMAP/POP3 and PST/OST |
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Destination |
Email Clients: Office 365/Outlook, Gmail (Google Workspace), IMAP Accounts |
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File Formats: PST, PDF, MBOX, EML, MSG, CSV, DOC, DOCX, JSON |
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Canary Mail stores its data on the IMAP server, so you need to migrate this application at the account level. This method is suitable to migrate Canary Mail to Office 365for a few mailboxes since it does not have filters, reports, folder retention, and other advanced settings. The SysInfo IMAP Backup Tool can help with that as it supports the Single and Batch CSV modes, OAuth authentication, mapping of email folders, filtering messages by date, and deduplication. Contacts and calendars need to be converted separately. This will help to automate all your migration processes.
Ans. You can perform migration using the SysInfo IMAP Backup Software. You just need to follow these steps:
1. Select IMAP and enter the credentials. Choose folders & select Office 365.
2. Modify with a filter and start.
3. After signing in to the target account, start the migration. That’s how you can migrate your mail securely.
Ans. Definitely. An IMAP migration tool will carry over the emails, with attachments, metadata, and timestamps, and the folder structure of the target mailbox will be left as it was in the original. When the process is complete, one should verify the item and attachment counts in Office 365 before deleting from the source account.
Ans. No. Canary Mail doesn’t store your mailbox data; it display from your mail server. So exporting emails beforehand isn’t necessary. The only thing required is the account’s login information, as it is needed to sign in with Canary Mail.
Ans. Surely. The professional tool ensures to maintain the original folder and subfolder hierarchy during migration. As a result, users can locate their emails in the same folders as in the original.
Ans. Yes. Batch CSV mode allows connecting several IMAP accounts by importing a CSV file or by manually entering the details, and validating and migrating them at once. It is recommended that credentials for each source account and the corresponding Office 365 mailbox are available.
Ans. The duration depends on multiple factors such as mailbox size, the number of folders, network speed, Microsoft 365 throttling limits, etc. Small mailboxes finish quickly, whereas large or multi-account migrations take longer. Applying date filters or migrating in batches helps manage the time effectively.
Ans. Yes. You can choose according to your mailbox size:
1. A single mailbox: OAuth 2.0.
2. Multiple mailboxes/Admin Login: Modern Auth (OAuth) or Client Secret (Tenant ID, Client ID, and Client Secret)
Ans. Surely. IMAP Backup tool will read the mailbox and put it in its destination, leaving the source as is. The only thing that would have source emails deleted post-migration is the Free Up Server Space option; best to leave that off unless there is cause for it.
Ans. Yes. IT Admins can migrate using Batch CSV mode, provided all employees have credentials through it. Then, they can migrate easily in a single run.
Ans. Definitely. The Date Range Filter is provided in SysInfoTools, which has two fields: a start and end date to filter emails within a specific date range. Additionally, Skip Previously Migrated helps in later runs by transferring only new emails.
About The Author:
Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms.
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