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Administrator setup for GSSMO

If you have the legacy free edition of Google Apps, upgrade to G Suite to get this feature.

This page is for administrators who plan to deploy G Suite Sync for Microsoft® Outlook (also known as GSSMO) for other users in their organization. To install GSSMO yourself and begin using it, you should instead see the GSSMO user help.

What is GSSMO?

G Suite Sync for Microsoft Outlook is a Microsoft Outlook plug-in that lets you use Microsoft Outlook as a client for G Suite email, calendar, and contacts. Email, calendar events (including recurring meetings), and contacts are all synchronized between G Suite and Microsoft Outlook. Outlook Notes are synced with Google Docs. Outlook Tasks are synced with your Gmail task gadget. And your organization's global address list is automatically synchronized, as well. This includes your G Suite users, groups, shared contacts, and conference rooms, and provides contact look-up as well as free/busy information for users and conference rooms.

Beta feature: Synchronizing Outlook Notes and Tasks with G Suite are currently Beta release features.

Data synchronization occurs on the following schedule (and also each time you start Outlook):

  • Email: Every minute
  • Calendar: Immediately after you create or receive a meeting invitation, or every 10 minutes
  • Contacts: Every 20 minutes
  • Global address list: Every 24 hours
  • Notes:  Immediately after creating or changing a note, or every 60 minutes 
  • Tasks: Every 2 hours

Importing: GSSMO also lets users import data from Outlook to G Suite—either when initially setting up their user profile in Outlook, or any time afterwards. When importing, people have the option to import directly from an Exchange account or from a PST file. Keep in mind that executables and attachments over 25 MB are not imported to Gmail, as per G Suite restrictions. See below for details.

For information about which Microsoft Outlook features are supported and how using this service differs from using Microsoft Outlook with other mail systems such as Microsoft Exchange, see the GSSMO user help.

G Suite requirements and settings

Edition requirements

  • G Suite, Education, or Government

Admin console settings

Enable the following features in your Admin console:

  1. Sign in to the Google Admin console.
  2. Turn on GSSMO for your account:
    1. From the dashboard, click Apps, then click G Suite > Gmail > User settings.
    2. In the GSSMO section, check Enable G Suite Sync for Microsoft Outlook for my users.
    3. Click Save.
  3. Turn on the Google Calendar service (so users can create profiles). See Turn Calendar on or off for users for details. 
  4. To use Global Address List (GAL) Generator:
    1. From the dashboard, go to Security > API reference. Where is it?
    2. Check Enable API Access.
    3. Click Save.
  5. Turn on contact sharing (so users' Global Address Lists are dynamically updated):
    1. Click Apps > G Suite > Contacts > Sharing settings.
    2. Select Enable contact sharing.
    3. Click Save.
  6. Turn on the Drive service and Drive apps (required for notes sync to Drive):
    1. To turn on Drive, see Turn Drive on or off for users
    2. To allow users to install Drive apps, click Apps > G Suite > Drive > Data Access.
    3. In the Drive SDK section, check Allow users to install Google Drive apps.
OS and Microsoft Outlook requirements

Links to Microsoft's website are provided for your convenience. The links and their content may change without notice. Please consult Microsoft's website for the latest configuration and support information.

Operating system requirements

Note: G Suite Sync for Microsoft Outlook is not supported for Mac. Microsoft Outlook for Mac does not support the Messaging Application Programming Interface (MAPI), which is required for GSSMO to communicate with Outlook. This Outlook limitation makes a Mac-compatible version of GSSMO infeasible.

Microsoft Outlook requirements

Permissions requirements for users

Users need to have local admin permissions for their computers in order to perform the installation.

Port requirements

Open port 443 for the following applications on the computer on which you install G Suite Sync for Microsoft Outlook:

  • Outlook.exe
  • ProfileEditor.exe
Install GSSMO

GSSMO must be installed on each person's computer, who wants to use the plug-in. You have two options for installation:

  • Push an .msi file to your users and let them use the Run Advertised Programs option in the Windows Control Panel. Download the .msi file below—be sure to pick the correct one, based on your users' version of Outlook. For information on implementing the .msi file, consult your Windows documentation.
    Download 32-bit enterprise_gsync.msi (Outlook 2003, 2007, 2010, 2013, 2016 32-bit editions)
    Download 64-bit enterprise_gsync.msi (Outlook 2010, 2013, 2016 64-bit editions)
  • Let users download GSSMO themselves from the GSSMO download page. They can then follow these instructions to install the plug-in.

Importing: To migrate their old Outlook data to G Suite, users also need a separate tool, G Suite Migration for Microsoft Outlook. Users who download GSSMO version 2.1 or later from the download page get this migration tool, automatically. If you push GSSMO to users via an .msi file, however, you'll need to push G Suite Migration for Microsoft Outlook to them as well, or have them install the migration tool themselves. See below for details.

Integration with G Suite Migration for Microsoft Outlook

GSSMO lets users import data from an Exchange account or Outlook PST file using a separate migration tool, G Suite Migration for Microsoft Outlook. The import experience is seamless for users in that GSSMO launches the migration tool for them, so in most cases, users won't even notice they're using a separate tool.

GSSMO launches the migration tool in the following cases:

  • When users import data while creating their user profile—either when first installing GSSMO or by choosing GSSMO > Set up a GSSMO user from the Windows Start menu (see creating a new profile).
  • When users choose to import data to an existing profile by choosing GSSMO > Import data to GSSMO from the Windows Start menu.

In each of these cases, users can import mail, contacts, calendar events, and Outlook notes, which become available both in Outlook and the G Suite web interface. They can also import Outlook tasks, and journal entries, which remain available only in Outlook.

Migration tool must be installed: For G Suite Migration for Microsoft Outlook to launch, the tool must be installed on the user's computer. Downloading GSSMO version 2.1 or later from the GSSMO download page downloads G Suite Migration for Microsoft Outlook automatically, so users who do that can import data with no extra setup. Users who are upgraded from a previous version of GSSMO, however, need to install G Suite Migration for Microsoft Outlook themselves if they want to import data. For details, see enable my import options.

You'll also need to push the migration tool to users who install GSSMO via an .msi file, as downloading the .msi installation file does not automatically install G Suite Migration for Microsoft Outlook. For more, see install GSSMO, above.

Running G Suite Migration for Microsoft Outlook standalone: Note that users can also launch G Suite Migration for Microsoft Outlook as a standalone application from the Windows Start menu > G Suite Migration for Microsoft Outlook menu. However, this doesn't import Outlook notes, tasks, or journal entries. To import this data, users should run their migrations via GSSMO.

Query free/busy information for Exchange users

If you're using GSSMO in a mixed G Suite/Exchange environment, and you want to query free/busy information for Exchange users, you need to:

  • Enable Google Calendar Connectors. Consult for information about setting up and managing the Google Calendar Connector Web Service.
  • Create the following registry key and accompanying string value on each computer where GSSMO is installed:
    • Registry key: HKEY_CURRENT_USER\Software\Google\GSSMO\CalendarSync
    • String value: Value name: FreeBusyURL; Value data: <URL for the Calendar Connector>—for example, (where you replace MY_COMPANY_FREEBUSY_SERVER with the name of your company's server).
    Note: If you're running a 32-bit version of Outlook on a 64-bit version of Windows, create this registry key in the correct location for 32 bit applications. For details, see the instructions on using the Windows registry at Configure limits and options via the registry.
Control automatic updates

As an administrator, you can use Google Update to control whether or not GSSMO is automatically updated on your users' computers. Learn more


Related topics:

To submit feedback or get help:

Note that Google Cloud support can provide support for the sync tool, but not for Microsoft Outlook or Windows. If you have additional Outlook or Windows questions, please contact Microsoft.

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