The ads are compounding the concern over the changes to Gmail, which has more than 425 million active users and a significant chunk of the world's free email accounts, according to market researcher comScore. Though Gmail users can't see the changes when accessing their messages on iPhones, Google's Web mail application is widely used on desktops. Ms. Freund said more than half of all users have the updated Gmail layout, which the company has been gradually rolling out since May.

这些广告加剧了对于Gmail变化的担忧。据市场研究机构comScore的数据，Gmail拥有逾4.25亿活跃用户，在世界免费电子邮件账户中也占据了极大份额。虽然Gmail用户通过iPhone访问邮件时看不到这些变化，但谷歌的网页版邮件应用在台式电脑上应用十分普遍。弗罗因德说，一半以上的用户升级了Gmail的版式，谷歌自5月以来一直在逐步推出这种布局设计。

Prolific emailers like Delta Air Lines Inc., Gap Inc., Gilt Groupe Inc. and Groupon Inc. have sent step-by-step instructions to their mailing lists on how to move messages out of the Promotions tab and back to Gmail's 'Primary' folder.

像达美航空公司(Delta Air Lines Inc.)、Gap Inc.、Gilt Groupe Inc.和Groupon Inc.等发送较多电子邮件的企业向其邮寄对象发送了如何将信息从“推广”文件夹移回“主要”文件夹的详细指导。

Marketers fear the new system could spread and put an unwanted kink in a tried-and-true method of driving sales, not to mention business models that rely on emailed coupons.

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