What’s migrated in an Exchange Online migration?

Exchange Online Calendar migration using the new data migration service is currently in beta and subject to the Pre-General Availability Offerings Terms in the Google Workspace Service Specific Terms.

Exchange Online data migration copies data from your Microsoft Exchange Online business editions to accounts for your organizations’ Google Workspace users. The tool doesn’t delete or modify existing data from Microsoft Exchange Online, but some features available in Microsoft Exchange Online aren't supported in Google Workspace.

Migrated data and features

Email

• Email messages— all emails messages, including drafts and sent items, under all folders and subfolders. You can exclude junk email and deleted items.
• Folders and subfolders—migrated to Gmail as labels.  For details, go to How folders are migrated (below).
• Attachments—attachments are migrated to Gmail unless the message plus attachment is larger than 25 MB, or the file type is blocked by Gmail, such as executable files. For details, go to File types blocked in Gmail.
• Status—read and unread status of email messages.
• Importance level—messages with a High importance level are migrated to an Important label. Messages with a Low or Medium importance level don’t get an Important label.
• Shared mailboxes—migrate to Gmail as regular mailboxes. You can allow Gmail delegation after the migration. For details, go to Turn Gmail delegation on or off.
• Email status indicators—Snoozed emails are migrated to a custom Snoozed label and archived emails are migrated to custom Archive_ label.

Calendar (beta)

• Calendars—primary and additional calendars are migrated. 
• Resource calendars—are migrated if suitable mapping is provided. 
• Events after the migration start date (configurable)—the following calendar data is migrated:
  • All-day events
  • Attendee with the target email id (if attendee mapping is provided)
  • Status, sensitivity, and reminders
• Recurring events—recurring events with no end date are migrated with an end date of December 31, 2099.
• Timezone—the event timezone is preserved.
• Microsoft Teams Meetings—meeting links are migrated. Meetings are not converted to Google Meet meetings.

What's not migrated?

Email

• Emails larger than 50 MB
• Draft emails without a From header
• Categories
• Emails in Notes or any of its subfolders
• In-place Archive mailboxes
• Certain email status indicators, including pinned, flagged, snoozed, scheduled, and archived
• Shared folders
• Starred folder status

Calendar (beta)

• Calendar specific settings such as color and timezone
• Additional calendars for resources are not supported by Google Calendar
• Calendars shared with the user
• Events that occur before the provided migration start date
• Event attachments
• If an event that was already migrated is modified by the user in Google Calendar, the event will not be imported again in future delta or full migrations.
• Event descriptions are migrated as text. Formatting is not supported.

How folders are migrated

Microsoft Exchange Online folders migrate as labels in Gmail. Labels have the same name as their source folders. The table below details how folders are mapped to labels.

Watchpoints:

• If there's a naming conflict between a folder and a Gmail reserved system label (such as Sent, Trash, or Unread), the messages are migrated to the reserved label.
• Folder names with slashes (such as, “A/B/C”) become labels with underscores (such as,“A_B_C”).
• Shared folders are not migrated.
• Starred folder status is not migrated.
• Messages that are present in more than one folder are only migrated once. For example, if the message is present in FolderA and FolderB in Outlook, then it will get migrated to either FolderA or FolderB in Gmail. The customer can search under All Mail to find the message.
• During migration, a folder's full path becomes the label name. Folders with folder paths longer than 225 characters aren't migrated. The messages inside these folders are migrated, but will not include the label.