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Migrate email from Microsoft 365 to Google Workspace

Yes. You can move every email from Microsoft 365 to Google Workspace without losing folders, read status or dates. Connect both mailboxes over IMAP and IMAP Migrator copies the messages server to server, leaving the source mailbox untouched. Small mailboxes finish in minutes; because Google limits IMAP uploads to about 500 MB per account per day, large mailboxes take several days.

Start migrating Free trial for one small mailbox · plans from $4.99 per day

At a glance

FromMicrosoft 365 · outlook.office365.com:993 (SSL)
ToGmail / Google Workspace · imap.gmail.com:993 (SSL)
CopiedEvery folder, read and flagged state, received dates. Duplicates are skipped.
Source mailboxOpened read-only; nothing is changed or deleted.
Calendars and contactsYes, in a separate run

Step by step

  1. Prepare Microsoft 365

    Microsoft turned off password logins for IMAP, so use "Sign in with Microsoft" in the console. The mailbox must have IMAP enabled. Turn on IMAP per mailbox: Exchange admin center → Recipients → Mailboxes → the user → Manage email apps → IMAP.

  2. Prepare Google Workspace

    Create the Workspace users first; each needs a licence with Gmail. Google accepts about 500 MB of IMAP uploads per account per day, so a large mailbox fills over several days. Use "Keep syncing new mail" and let it catch up. Sign in with Google in the console, or use an app password (Google Account → Security → 2-Step Verification → App passwords). Your normal password is refused.

  3. Enter the servers and accounts

    In the console, use outlook.office365.com as the source and imap.gmail.com as the target (port 993, SSL). Add the accounts one per line (email, then password) or upload a CSV. To let each person type their own password, send invitation links instead.

  4. Validate and estimate

    "Validate accounts" tries every login; "Estimate size and time" shows the message count, total size and free space on the target.

  5. Launch and watch

    Start the migration and follow progress per account and folder with a live action log. Copied messages are never copied twice, and an interrupted run continues where it stopped.

  6. Switch MX

    After the first copy, point the MX record to the new provider and press "Final sync" to bring over mail that arrived in between.

Good to know about Microsoft 365

  • Sent, Drafts, Trash and Junk are mapped to Sent Items, Drafts, Deleted Items and Junk Email automatically.
  • Messages above the mailbox size limit (35 MB by default, up to 150 MB) are refused and listed as failed.

Good to know about Google Workspace

  • Labels become folders. A message with two labels is stored once per folder on the target.
  • Google allows about 2,500 MB of IMAP downloads per account per day, so very large source mailboxes can pause until the next day; the run resumes where it stopped.

Questions

Will my email be deleted from Microsoft 365?

No. The source is opened read-only; messages are copied and even their read state stays the same.

Are folders, read status and dates kept?

Yes. Every folder, the read and flagged state and the received date are copied as they are. Sent, Drafts, Trash and Junk are mapped to the target's own folders.

How long does it take?

Small mailboxes finish in minutes; because Google limits IMAP uploads to about 500 MB per account per day, large mailboxes take several days.

Can I move many mailboxes at once?

Yes. Add hundreds of mailboxes as a list or CSV and several run in parallel. If you do not want to collect passwords, send invitation links so each person types their own.

Are calendars and contacts moved too?

Yes. Calendars and contacts are copied in a separate run: through Google and Microsoft 365 sign-in, and over CalDAV/CardDAV for other providers.

What does it cost?

You pay for days of access: pick a day, a week or a month and move unlimited accounts and messages in that time. There is a free trial for one small mailbox.

Last updated: 18 September 2026