Add Gmail to another email client - Gmail Help

You can add Gmail to other email clients, like Microsoft Outlook, Apple Mail, or Mozilla Thunderbird. When you add Gmail, your messages and labels are synced with the email client. Changes to Gmail syncing with other email clients To keep your account more secure, Gmail no longer supports third-party apps or devices which require you to share your Google username and password. Sharing your account

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Outlook ExpressにGmailの設定をする