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Set a local mailbox size

Google Workspace Sync for Microsoft Outlook

When you use Google Workspace Sync for Microsoft Outlook (GWSMO), your mail is stored both remotely in the cloud, and locally in a PST mailbox file on your computer. The cloud can hold up to 30 GB of mail (or more), which is much more than you'd typically want to keep on your computer. The amount of mail stored locally is instead limited by Microsoft Outlook's mailbox size.

If you run out of space locally, older mail is removed from your computer and replaced with newer messages. All messages remain available in your Gmail account on the web. Most people do fine with a local limit of 1 GB. But to store more mail locally, you can choose a larger mailbox size.

Note: You can only search locally stored emails in Outlook. If your Gmail inbox size exceeds your local mailbox size, emails excluded from your local mailbox do not appear in Outlook search results. You can still search for these emails using the Gmail web interface.

Set Outlook's mailbox size with GWSMO (Recommended)

The GWSMO product can help you change Outlook's mailbox size.

  1. Click GWSMO "" in your Microsoft Windows taskbar notification area.
    1. The GWSMO icon appears in the notification area, typically next to the clock. This area has been known historically as the system tray. From here, you can open the GWSMO settings.
    2. If you cannot find the icon, it might be automatically hidden within the overflow area. To view all icons, click the up arrow on the taskbar.
    3. Note: The icon only appears if GWSMO is running.
  2. Choose Set mailbox size limit.
  3. Select a mailbox size from the dialog that opens. Your size options are 1 GB, 2 GB, 4 GB, or Unlimited. Note that depending on your computer, a larger size might degrade performance when searching and indexing.

FAQ

Why is the Set mailbox size limit option not shown? This command isn't available if your mailbox size limit was set using a Windows Registry key.

Why is a size option not available? If your local PST file already exceeds one of the size options, the option is no longer available in the Set Mailbox Size dialog. That is, once you select a larger size and your PST file grows to that size, you can't go back.

Why is my PST file larger than the size limit? It's possible your PST file might exceed the size limit. It depends on your Outlook set up. Consult your Microsoft documentation on how to configure the size limit for PST files in Outlook. You can also reduce a local PST file, which helps compact the file's size. After reducing the PST file a smaller mailbox size limit might become available.

Does the Unlimited size option really mean unlimited? No. By default, Outlook limits the size of a local PST file to 20 GB (for Outlook 2007) or 50 GB (for Outlook 2010, 2013, 2016, or 2019). So, if you choose the Unlimited mailbox size in GWSMO, your PST file won't exceed 20 GB or 50 GB. To increase the limit of your PST file, consult your Microsoft documentation. (Note that if you choose the Unlimited mailbox size in GWSMO and your PST file grows larger than your default Outlook limit, you might encounter sync errors. In addition, large PST files can create performance problems.)

Does setting the mailbox size impact all my Outlook accounts? No. Setting Outlook's mailbox size only affects the primary mailbox account. To apply a different mailbox size limit to your delegated accounts, you must set the mailbox size limit using a Windows Registry key. For details, go to Set mailbox size.

Set Outlook's mailbox size with a Windows Registry key (Advanced)

The Windows Registry is used to store information, settings, options, and other values for Windows software and hardware. The data is structured in a tree format and the configuration settings exist in registry keys and registry values.
You or your administrator can set the mailbox size limit using a Windows Registry key. For details, go to Set mailbox size. Note that you can use either the registry key or the Set mailbox size limit option in GWSMO, but not both.
Consult your Microsoft documentation for more information on the Windows Registry.

Reduce a PST file

You can try using Outlook to compact a local PST file, in which case a smaller mailbox size limit option might become available. Consult your Microsoft documentation on how to reduce the size of your mailbox and Outlook Data File.

Change a PST file location with GWSMO

You or your administrator can update the folder location of a local PST file.

  1. Click GWSMO "" in your Microsoft Windows taskbar notification area.
    1. The GWSMO icon appears in the notification area, typically next to the clock. This area has been known historically as the system tray. From here, you can open the GWSMO settings.
    2. If you cannot find the icon, it might be automatically hidden within the overflow area. To view all icons, click the up arrow on the taskbar.
    3. Note: The icon only appears if GWSMO is running.
  2. Choose Modify PST/logs folder paths.
  3. Use PST Folder Path to update the location of the PST folder.

Note: If you modify the PST folder path, the new location only applies to PST files associated with profiles created after the path change.

For details about GWSMO trace log files, go to Where can I find trace log files?


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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