Share via

Query on Migration

Glenn Maxwell 13,841 Reputation points
2026-06-17T17:24:09.1633333+00:00

Hi All,

I’m not sure if this is the right forum for this question, but I am planning to migrate mailboxes from Google Workspace (Gmail) to Microsoft 365 using the Microsoft FastTrack migration service.

My project settings are:

  • Exclude rules: No
  • Exclude calendars from the migration: No
  • Exclude contacts from the migration: Yes
  • Exclude tasks from the migration: Yes
  • Exclude permissions/delegation from the migration: Yes

Based on these settings, I would like to confirm exactly what data will and will not be migrated.

My understanding is as follows:

Will Migrate

  • Emails
  • Calendar items
  • Gmail labels/folders
  • Mail rules/filters

Will Not Migrate

  • Contacts
  • Tasks
  • Email signatures
  • Automatic replies (Out of Office settings)
  • Mailbox permissions/delegation

Can anyone please confirm whether the above understanding is correct for a Google Workspace (Gmail) to Microsoft 365 migration using Microsoft FastTrack?

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

0 comments

Answer accepted by question author

Hin-V 16,065 Reputation points Microsoft External Staff Moderator
2026-06-17T19:22:02.4233333+00:00

Hi @Glenn Maxwell

Thank you for reaching out. 

Based on my research, your understanding of what will and will not be migrated is mostly accurate and aligns well with the current documented capabilities. 

With your current configuration, mailbox content such as emails (including attachments), calendar items, Gmail labels (which are converted into folders in Exchange Online), and mail rules or filters will be migrated. However, please note that while rules are migrated, they are typically brought over in a disabled state and will need to be reviewed and enabled by users after the migration. Additionally, calendar data is migrated, but there are some known limitations, for example, shared calendars and certain visual elements such as event colors are not preserved during the process.  

As expected based on your settings, contacts and tasks will not be migrated since they are explicitly excluded. In addition, some mailbox-related configurations are not included in the migration scope at all, regardless of settings. This includes email signatures, automatic replies, and mailbox permissions or delegation. These elements are either stored differently at the platform or client level or are not supported by the migration engine, and therefore must be reconfigured manually after the migration is complete.  

While the overall mapping of data is correct, it is worth highlighting that migration does not always result in a perfect one-to-one experience. For example, Gmail’s labeling system differs from Outlook’s folder structure, which can lead to slight differences in how messages are organized after migration. Similarly, some rule logic or calendar behaviors may require minor adjustments. 

For this reason, I would recommend starting with a small pilot batch to validate the results in your environment, particularly focusing on calendars and rules to ensure they behave as expected. 

Overall, your understanding is correct. The only important nuance is that while the core data is migrated successfully, some configuration elements and user-specific settings require manual reconfiguration, and certain features may not transfer with full fidelity. 

User's image

References:  

https://mms.heiai.top/en-us/microsoft-365/fasttrack/data-migration

Perform a Google Workspace migration to Microsoft 365 or Office 365 | Microsoft Learn 

If you have any additional concerns, feel free to comment below. I would be more than happy to assist. 

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

Was this answer helpful?

1 person found this answer helpful.

1 additional answer

Sort by: Most helpful
Most helpful Newest Oldest

  1. AI answer

    2026-06-17T17:24:26.23+00:00

    For a Google Workspace (Gmail) → Microsoft 365 migration using Microsoft’s Google Workspace migration tooling (and therefore FastTrack, which uses the same platform), the understanding is mostly correct, with a few clarifications based on documented behavior and limitations.

    Will migrate with your settings

    • Email messages
      Yes. Mail is migrated, subject to standard limitations (for example, maximum message size based on the Exchange Online transport configuration; default 35 MB unless increased).
    • Gmail labels/folders
      Yes. Gmail labels are mapped to folders in Exchange Online. You can optionally exclude specific folders/labels using the -ExcludeFolder parameter if starting batches via PowerShell, but in your scenario you are not excluding them.
    • Calendar items
      Yes, because “Exclude calendars” is set to No.
      However, there are documented limitations: shared calendars and event colors are not migrated.
    • Mail rules/filters
      Yes, because “Exclude rules” is set to No. Rules are migrated but are left disabled by default in Exchange Online; users should review and then enable them in Outlook.

    Will not migrate with your settings

    • Contacts
      Correct. “Exclude contacts” is set to Yes, so contacts are not migrated. When contacts are migrated (in other scenarios), only up to three email addresses per contact are migrated, and Gmail tags/contact URLs/custom tags are not migrated.
    • Tasks
      Correct. “Exclude tasks” is set to Yes, so tasks are not migrated.
    • Mailbox permissions/delegation
      Correct. “Exclude permissions/delegation” is set to Yes, so those are not migrated, even though there is a 1P solution to migrate them from Google Workspace when enabled.

    Items not migrated regardless of your flags (per documented limitations)

    These are not migrated by the Google Workspace migration tooling and therefore also not by FastTrack when using that tooling:

    • Automatic replies / vacation settings / Out of Office
      Not migrated. Vacation/automatic reply settings are explicitly listed as a mail limitation.
    • Room bookings
      Meeting room bookings are not migrated.
    • Shared calendars
      Not migrated.
    • Calendar event colors
      Not migrated.
    • Gmail-specific contact metadata (when contacts are migrated)
      Gmail tags, contact URLs, and custom tags are not migrated.

    Items not explicitly covered in the documentation

    • Email signatures
      Signatures are not mentioned as migrated content in the Google Workspace migration documentation and are not part of the supported data types (mail, calendar, contacts, tasks, permissions/delegation). They should be considered not migrated and recreated in Outlook / Outlook on the web.

    So, adjusted summary for your configuration:

    Will migrate

    • Emails (subject to size and other standard limits)
    • Gmail labels/folders (as folders)
    • Calendar items (but not shared calendars or event colors)
    • Mail rules/filters (migrated but disabled by default)

    Will not migrate

    • Contacts (because excluded)
    • Tasks (because excluded)
    • Mailbox permissions/delegation (because excluded)
    • Automatic replies / vacation settings
    • Room bookings
    • Shared calendars
    • Calendar event colors
    • Gmail contact tags/URLs/custom tags (if contacts were included)
    • Email signatures (not part of supported migrated data)

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.