Google Workspace Sync for Microsoft Outlook

Below are common questions about running a sync with Google Workspace Sync for Microsoft Outlook (GWSMO).

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Set up

Can GWSMO help me import Exchange data to Google Workspace?

Yes. You can save your Microsoft Exchange data as a PST file before you import the data. For details, go to Import data and monitor a migration. You can also choose the option to import your data later.

If all you want to do is import data to your Google Account—that is, you don't plan to keep working in Outlook—use Google Workspace Migration for Microsoft Outlook (GWMMO) instead of installing GWSMO.

Can I import my Outlook data from a hosted service other than Exchange?

Yes. Export the data from Outlook as a PST file and then import it using the option to import your data later. You can also use Google Workspace Migration for Microsoft Outlook (GWMMO).

Can I use GWSMO with my Mac version of Outlook?

No. GWSMO isn't supported for macOS. Outlook for Mac doesn't support Messaging Application Programming Interface (MAPI), which GWSMO needs to communicate with Outlook.

To move data from Apple to Google Workspace, see Migrate data from Apple to Google Workspace.

Is my data secure when I use GWSMO?

Yes. GWSMO uses TLS to securely communicate with Google and OAuth to authorize access to accounts.

Can GWSMO import continuously from Exchange and sync mail on an ongoing basis?

No. When importing from an Exchange profile, GWSMO takes a snapshot of the profile's current data and imports only that. After the import is complete, no new mail, calendar events, or other data received on the Exchange server synchronizes with your Google Account.

To sync email continuously between an Exchange server and Google Workspace, your administrator must set up dual delivery.

Will my existing Outlook plugins work?

Most plugins should keep working as usual. Some plugins are turned off during the GWSMO installation process, including:

  • Acrobat PDFMaker toolbar
    (registry key: HKLM\SOFTWARE\Microsoft\Office\Outlook\Addins\PDFMOutlook.PDFMOutlook)
  • Outlook Change Notifier
    (registry key: HKLM\SOFTWARE\Microsoft\Office\Outlook\AddinsOutlookChangeNotifier.Connect)

We recommend turning off anti-virus plugins, because they can cause issues with synchronization.

What does each GWSMO component do?
  • Crashsender.exe—Sends information to Google in the event of a crash. To do so, users must have enabled crash reports when they created their profile. For details, go to Send usage & crash reports.
  • Gsync32.dll—Add-in and provider library that's loaded in Outlook when a user opens a GWSMO profile.
  • Profileeditor.exe—Sets up a new profile or adds an account for delegation. 
  • Profilepassworddelete.exe—Deletes GWSMO access credentials. 
  • Unifiedlogin.dll—Library that performs authorization for Google APIs.

What's supported

What data is and isn't synchronized between Outlook and my Google Account?

All of your mail, calendar events, and contacts as well as your Microsoft Outlook notes and tasks are synced.

Data a Google Workspace product doesn't support, or is otherwise incompatible, isn't synchronized, including:

  • Outlook journal entries
  • Follow-up flags
  • Distribution lists
  • Rich formatting in contacts

You keep using these features in Outlook. Sometimes, you can use equivalent features with a Google Workspace product. However, the data isn't synchronized back and forth.

For a complete list, go to What's synchronized between Outlook and Google Workspace?

Which Outlook features does GWSMO not support?

Some Outlook features can't be used when you're using GWSMO. For example, you can't use public folders or send an email in Rich Text Format (RTF).

Go to What's synchronized between Outlook and Google Workspace?

What gets imported to Outlook?

Email messages, folders, calendar events, contacts, tasks, notes, journal entries, etc. A few items that don't get imported to Outlook include public folders, category assignments for mail messages, mail signatures, and rules. Journal entries import to Outlook, but they don't import to your Google Account.

Sync issues

Why don't sent messages show up in my Outlook Sent Items folder?

You might need to set it up. Consult your Outlook help on how to save messages to the Sent Items folder.

I got an email with the subject "Email messages were found in the 'Sent Items' folder..."

Messages in your inbox with the subject "Email messages were found in the 'Sent Items' folder that were not sent" means you have messages that haven't been successfully sent.

To send the unsent messages:

  1. In Outlook, open your Sent Items folder.
  2. Search for messages with the category "Unsent message" assigned.

    Note: The easiest way to search is, in the Search Sent Items bar, enter category: Unsent message.

  3. Open the messages and resend them.
"Out of memory error when synchronizing Notes"

A message in your Outlook Sync Issues folder with the subject "Out of memory error when synchronizing Notes" indicates there's an error that prevented Notes from synchronizing completely. However, Notes hasn't stopped synchronizing and if the message doesn't reappear, you don't need to take action.

If you keep getting the message, you should simplify the structure of folders in your Google Drive. Specifically, we recommend My Drive doesn't have more than:

  • 4 levels of nested folders
  • 500 folders in total
  • 200 plain text files in total

For details about how GWSMO synchronizes Notes with plain text files in Drive, go to Outlook Notes.

Why do I get duplicate birthday events in Google after a sync?

You might get this issue when you add birthday information to a contact in Outlook (even if the contact was created in Google). Doing so automatically creates a birthday calendar event in Outlook’s calendar. After a sync, the event appears twice in Google—in the main Google calendar and the Birthdays calendar.

To work around this issue, choose an option:

  • Add the birthday information to the Google, not Outlook, contact.
  • Unsubscribe from the Google Birthdays calendar.


What happens if a user's email address changes?

If a user's email address changes, the user must create another GWSMO profile. Go to Recreate or replace your profile.

Google, Google Workspace, and related marks and logos are trademarks of Google LLC. All other company and product names are trademarks of the companies with which they are associated.

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