What’s migrated in an Exchange Online migration?

Use the new data migration service to migrate Microsoft Exchange Online data to your organizations’ Google Workspace users.

You can copy:

• Email data
• Calendar data
• Contact data

The tool doesn’t delete or modify existing data in Exchange Online, but some features are not supported in Workspace.

Migrated data & features

The following email data migrates:

• Email messages—All email messages, including drafts and sent items, in all folders and subfolders. You can exclude junk email and deleted items.
• Folders and subfolders—Migrate to Gmail as labels. For details, go to  How folders are migrated  (later on this page).
• Attachments—Migrate to Gmail unless the message plus the attachment is larger than 25 MB or the file type is blocked by Gmail. For details, go to File types blocked in Gmail .
• Status—Read and unread status of email messages.
• Importance level—Messages with a Highimportance level migrate with an Importantlabel. Messages with a Lowor Mediumimportance level don’t get an Importantlabel.
• Shared mailboxes—Migrate to Gmail as regular mailboxes. You can allow Gmail delegation after the migration. For details, go to Let users delegate access to a Gmail account .
• Email status indicators—Snoozed email messages migrate with a custom Snoozedlabel. Archived email messages migrate with a custom Archive_label.

The following calendar data migrates:

• Calendars—Primary and additional calendars migrate.
• Resource calendars—Migrate if a suitable mapping is provided. 
• Events after the migration start date (configurable)—
  • All-day events.
  • Attendees with target email id (if attendee mapping is provided).
  • Status, sensitivity, and reminders.
• Recurring events—Recurring events with no end date migrate with an end date of December 31, 2099.
• Timezone—The event time zone migrates.
• Microsoft Teams meetings—Meeting links migrate. Meetings are not converted to Google Meet meetings.

The following contact data migrates:

• Contacts—All non-deleted contacts in your organization migrate. Individual users' contacts migrate. You can have up to 27,000 contacts in your organization.
• Folders—All non-deleted contact folders migrate. For details, go to How folders are migrated (later on this page).
• Categories—All categories with at least one contact migrate. Categories become labels in Google Contacts.
• Contact details
• Contact numbers—All business and home phone numbers migrate. One mobile phone number migrates for each contact.

What's not migrated?

The following email data isn't migrated:

• Email messages larger than 50 MB
• Draft email messages without a Fromheader
• Categories
• Email messages in Notesor any of its subfolders
• In-place Archive mailboxes
• Certain email status indicators, including pinned, flagged, and scheduled
• Shared folders
• Starred folder status

The following calendar data isn't migrated:

• Calendar-specific settings, such as color and time zone.
• Additional calendars for resources, which are not supported by Google Calendar.
• Shared calendars are not migrated to users with whom the calendar is shared. They are migrated only to the user who owns the calendar.
• Events that occur before the migration start date.
• Event attachments.
• If an event that was already migrated is modified by a user in Google Calendar, the event will not be migrated again in future delta or full migrations.
• Event descriptions migrate as plain text. Text formatting is not supported.

The following contact data isn't migrated:

• Certain types of contacts
  • Mail contacts
  • Your Global Address List
  • Deleted contacts and folders
• Contact lists
• Certain contact status information (although the contacts themselves are migrated):
  • Frequent contacts
  • Starred contacts—If you want these contacts to appear as favorites in Google Contacts, add them to a category named starred(the name is case-sensitive) in Exchange Online.

    Note:If you create a folder named starredin the previous version of Exchange Contacts and then turn on New Contactsin Exchange, the new version of Contacts might display the starredfolder as a category. This folder migrates to Google Contacts with the label starred. Contacts with the starredlabel are not marked as Favorites. 

• Empty categories that don’t contain any contacts
• Certain contact details:
  • Contact initials
  • Links to personal webpages
  • Profile pictures
  • Anniversary dates
• Contact numbers
  • If a contact has multiple mobile phone numbers, only one migrates
  • Home and business fax numbers
  • Pager numbers
  • Other numbers
• Any contact data that’s over the allowed limit. All Google Contacts limits apply to migrated contacts, including limits on the total number of contacts, size per contact, and the size of individual fields. Learn more

How folders are migrated

Microsoft Exchange Online email and contact folders migrate as labels in Gmail. Labels have the same name as their source folders. 

How email folders migrate

• 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.
• The 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 FolderAand FolderBin Outlook, then it will get migrated to either FolderAor FolderBin Gmail. Users 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.

The following table shows how email folders are mapped to labels:

How contact folders migrate

Google Contacts has a single-level hierarchy of labels instead of folders. Multiple levels of Exchange Online contact folders migrate into a single level of labels in Contacts. Exchange Online contact categories also become labels in Contacts.

Before migration, an Exchange Online contact folder might have a hierarchy like the following example:

• Folder1(parent folder)
  • Folder2(nested folder)
    • Contact1
      • Category1
      • Category2

After migration, all folders and categories are condensed into a single level of labels, with names that reflect their original Exchange Online hierarchy. Contact1 has a label for the folder where it was nested in Exchange Online, and separate label for each of its associated categories:

• Folder1migrates to a label called Folder1.
• Folder2migrates to a label called Folder1 - Folder2, which is associated with Contact1.
• Category1migrates to a label associated with Contact1.
• Category2migrates to a label associated with Contact1.

In addition, when you migrate contact folders to Contacts:

• If an Exchange Online contact folder and an existing Contacts label have the same name, the Exchange Online contacts migrate to the existing Contacts label.
• If an Exchange Online contact folder has a null name, such as “ “, the folder migrates with an underscore (“_”) for the name.
• Contacts in the Deletedfolder don’t migrate.