How to Import MBOX to G Suite (Google Workspace) - Complete Guide

Download, install, and launch the SysTools Import Tool. If the tool is not activated, refer to the activation guide: Activation Steps.

The tool includes a Help section detailing each import mode. Click the "Help" button on the top right to access this information.

On the Setup tab, select the source and destination platforms:

• Source: Choose MBOX.
• Destination: Choose G Suite.

Under Workload selection, check the Email checkbox to allow email import.

(Optional) Apply Date Filter: If you need to import emails from a specific date range, check the Date Filter box. Select the From Date and To Date using the calendar icons.

Once the setup is complete, click the Next button.

On the Source: MBOX screen, you need to specify the path to your MBOX files.

You will need to put MBOX files in the folders(created with the name of target O365 email IDs) as described below:

Create a folder in root drive, like:

• C:/MBOX/[email protected]/(put all MBOX files of user1)
• C:/MBOX/[email protected]/(put all MBOX files of user2)
• C:/MBOX/[email protected]/(put all MBOX files of user3)

etc...

Click the folder icon next to Import folder path. Ensure the folder name length is less than 60 characters, sufficient disk space is available, and correct file system permissions are set.

And then select the folder " C:/MBOX/" into our tool to migrate MBOX files.

In the "Select Folder" dialog, navigate to the folder containing your MBOX files (e.g., C:\MBOX) and click Select Folder.

After selecting the folder, click Validate to check permissions (Read file system, Read Email).

Once validation is successful (indicated by green checkmarks), click Next.

On the Destination: G Suite screen, provide the necessary credentials:

• Admin Email: Enter your G Suite administrator email address.
• Service Account: Enter the Service Account ID generated from Google Cloud Platform.
• Certificate File: Click the upload icon to select the .p12 certificate file for your service account.

For help with Google Cloud Platform project creation, refer to: Google Project Creation Steps.

After entering the G Suite credentials, click Validate to ensure the account has the required permissions (Read User, Write Email).

Once validation is successful (indicated by green checkmarks), click Next.

On the Users screen, you can add source users for processing. You have three options:

• Fetch Users: Automatically fetches users from the configured source (may attempt to identify MBOX files as users).
• Import Users: Allows you to import users using a CSV file (recommended for MBOX).
• Download Template: Downloads a sample CSV template for mapping source MBOX files to destination G Suite users.

Option A: Import Users via CSV (Recommended for MBOX)

1. Click Download Template to get a sample CSV file.

2. Open the downloaded UserMappingSample.csv file and edit it. Fill in the Source User (MBOX file name, often without extension, or full path if needed), Destination User (G Suite email), and set MarkForExecution to TRUE for users to be imported.

3. Save the CSV. Back in the tool, click Import Users.

4. Click the browse icon, select your edited CSV file, and click Open.

5. Click Upload.

6. A confirmation message will appear ("X Users imported. Processing Completed"). Click OK.

Option B: Fetch Users

1. Click Fetch Users. This will attempt to fetch users from the configured source account (for MBOX, it might identify based on file names).

2. A confirmation dialog will appear. Click Continue.

3. A success message ("X user(s) fetched. Processing Completed") will appear. Click OK.

The user list will be populated. Review the list:

• Select users for import by checking the checkboxes next to their names.
• (Optional) Set import priority using the star icon.
• Ensure the Destination Email is correctly mapped. You can edit this field if necessary.
• (Optional) Use the Show selected toggle to filter the list.

After selecting and mapping users, click Validate.

A confirmation message ("X User(s) validated. Processing Completed") will appear. Click OK.

Once users are validated, click the Start Import button.

A dialog will show your license information (Purchased, Consumed, Available). Click Start to begin the import.

A confirmation message ("Import started successfully.") will appear. Click OK.

The import process will begin. You can monitor its progress on the Import tab, under the Pending and In Progress sub-tabs.

The In Progress tab shows active imports. A banner may indicate that some features are unavailable during execution.

(Optional) Stop Import: If needed, click Stop Import.

Confirm by clicking Yes in the dialog.

A success message ("The process has been stopped successfully.") will appear. Click OK. Stopped imports will show their partial status.

Status of a stopped item.

Once the import finishes, successfully imported items will appear under the Completed tab.

(Optional) Re-Run Import: Click the Re-Run Import dropdown for more options:

• Retry Failed Items: Re-attempts import for items that previously failed. Select users and click Start.
• Re-Run Full Import: Re-imports all data for selected users. Select users and click Start.
• Delta Import: Imports only new data that has arrived since the last import. Select users and click Start.

Example: Retry Failed Items dialog.

Example: Re-Run Full Import dialog.

Example: Delta Import dialog.

After the import, you can download reports. Click the Download Report dropdown:

1. Import Summary Report:

• Select this option and save the Import-Summary-Report-[date-time].csv file.

The summary report provides a high-level overview of the import.

2. Detailed Report:

• Select this option. In the "Download Reports" dialog, select users and click Download.

• In the "Generate Report" dialog, click Download again.

• Save the Import-Detailed-Report-[date-time].zip file.

• Extract the ZIP file to view individual detailed CSV reports for each user.

The detailed report lists individual items and their status.

(Optional) Adjust Settings:

Navigate to the Settings tab.

Under General, you can adjust the Concurrent user slider to set the number of users processed simultaneously per account (e.g., to 10). Click Save.