What data GSMME migrates

G Suite Migration for Microsoft Exchange

G Suite Migration for Microsoft® Exchange (GSMME) is a utility that migrates email, calendar, or contact data from Microsoft Exchange, an IMAP server, or a personal storage table (PST) file to your G Suite domain.

You can also migrate data into Google Groups from Public Folders only. This migration must be done separately and cannot be combined with a migration of email, calendar, or contact data.

Consider the following data, and whether or not it's migrated, when you're setting up a migration to G Suite with GSMME. 

Source data Migrated to G Suite Notes
Email messages All email in top-level folders is migrated. A top-level folder is any folder that resides at the same level as your Inbox folder.

You have the option to exclude specific top-level folders from migration.

Email state such as read and unread  
Deleted items Migration is optional. Deleted items are labeled Trash in Gmail.
Folders Folders map to labels in Gmail. You can elect to omit top-level folders from migration. If you omit a folder, its subfolders are also omitted.

There is a 255 character limit per label. If you migrate a folder with a title over 255 characters, the mail will still migrate, but it will be put with the prior label.

Subfolders Unsupported Subfolders in your Exchange inbox don't migrate as nested labels in Gmail. Instead, the subfolders appear in an unnested state. For example, Receipts/2019 Q1.
Junk email

Migration is optional. Junk email is labeled Junk email in Gmail.

Public Folders

You can migrate content from Public Folders on your Exchange server to Google Groups. For details, see Migrate public folders.

Large messages and attachments

The maximum size limit for messages (message plus attachments) you can migrate to Gmail or a Google Group is 25 MB.

Attachments Most attachments are migrated, except when the message plus attachment is larger than 25 MB, or when there is an executable file in the attachment.
Executable files in compressed attachments These types of attachments aren’t allowed in Gmail. For details, see File types blocked in Gmail.
Posts in mailbox folders Not available in Gmail.
Importance levels of messages Not imported into Gmail.
Message flags Flags appear as stars in Gmail.
Rules Rules (both server and client) aren’t migrated but you can create equivalent filters in Gmail.
Signatures Not migrated but can be re-created in Gmail.
Category definitions or assignments Categories are not available in Gmail.
Microsoft Exchange data Migrated to G Suite Notes
Default calendar Includes all events, descriptions, attendees, and locations.

If you are using an exported or archived PST file, it's not possible to identify the primary root folder for Google Calendar and Contacts. Therefore, all calendars are migrated as “additional calendars” into Calendar, instead of any default calendar. You can avoid this by using a PST file migration for mail only and use an Exchange server migration for migrating calendars. For more details, see Migrate data from PST files.

Additional calendars Shared calendars are migrated for the owner, but not for other users who have access.
Event reminders  
Free or busy status Only other G Suite users can see the availability status in Google Calendar. You can use the Calendar Interop tool to allow Exchange users to see the availability status of G Suite users. Learn more about Calendar Interop
Calendar resources Use a comma-separated value (CSV) file to migrate calendar resources (such as meeting rooms) to G Suite. You can also change event attendees from email addresses in Exchange to G Suite email addresses. For details, see Create a mapping CSV file.
Rich content in event descriptions Unsupported Descriptions created in Outlook 2016 are converted to plain text.
Tentative or Out of Office status Any special status for calendar data is not migrated.
Optional attendees Not migrated.
Calendar attachments Not migrated.
Category definitions or assignments Categories are not available in Google Calendar.
Personal contacts
Microsoft Exchange data Migrated to G Suite Notes
All personal contacts Includes all fields (File As, images, notes, and so on).
Contact groups or personal distribution lists Contact groups or personal distribution lists don’t migrate to G Suite. You can still email a list from G Suite by creating a Google Group.
Multiple contact folders Unsupported Separate contact folders don’t migrate to G Suite. Instead, all contacts from all folders are migrated to Google Contacts. You can reorganize them using labels.
Rich formatting in personal contact notes Notes in contacts are migrated as plain text.
Notes larger than 16 KB Larger notes are truncated in G Suite.
Follow-up flags, dates, and reminders


Flags aren’t available in Google Contacts.
Category definitions or assignments Categories are not available in Google Contacts.
Global contacts
Microsoft Exchange data Migrated to G Suite Notes
Domain contacts

Domain contacts appear in the Global Address List (GAL) in Microsoft Active Directory®. They are usually contacts outside your domain.

You need to migrate these domain contacts separately. For details, see Sync your shared contacts.

Notes, Tasks, Journal entries, and RSS feeds
Microsoft Exchange data Migrated to G Suite Notes
Notes Not migrated.
Tasks Not migrated.
Journal entries Not migrated.
RSS feeds Not migrated.
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