G Suite for Outlook FAQ

G Suite Sync for Microsoft Outlook

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Should I use GSSMO?

Can GSSMO help me import Exchange data to G Suite?

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

If all you want to do is import data to your Google Account—that is, you don't plan to keep working in Outlook® after—use G Suite Migration for Microsoft Outlook instead of installing GSSMO.

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 import data when you install GSSMO option or use G Suite Migration for Microsoft Outlook.

Can I use GSSMO with my Mac version of Outlook?

No. GSSMO isn't supported for Apple® Mac®. Outlook for Mac doesn't support Messaging Application Programming Interface (MAPI), which is required for GSSMO to communicate with Outlook. 

Is my data secure when I use GSSMO?

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

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

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

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

Will my existing Outlook plugins work?

Most plugins should keep working as usual. Some plugins are disabled during the GSSMO 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 disabling any anti-virus plugins, because they can cause issues with synchronization.

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 that isn't supported by a G Suite tool 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. In some cases, you can use equivalent features with a G Suite tool. However, the data isn't synchronized back and forth.

For a complete list, see What's synchronized between Outlook and G Suite? 

Which Outlook features aren't supported by GSSMO?

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

See What's synchronized between Outlook and G Suite?

What gets imported to Outlook?

Email messages, folders, calendar events, contacts, tasks, notes, journal entries, and more. A few things 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. Refer to Outlook help on how to save messages to a 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 that 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 that have 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 was an error that prevented Notes from synchronizing completely. However, Notes hasn't stopped synchronizing and you don't need to take action if the message doesn't reappear.

If you keep getting the message, you should simplify the structure of folders in your Google Drive. Specifically, we recommend that 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 GSSMO synchronizes Notes with plain text files in Drive, see Outlook Notes.

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

You might see 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 GSSMO profile. See Create or replace your GSSMO profile.

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