As of 2017, storage of up to 15 gigabytes is included, and paid plans are available for up to 30 terabytes for personal use.The Gmail user interface initially differed from other webmail systems with its focus on search and conversation threading of emails, grouping several messages between two or more people onto a single page, an approach that was later copied by its competitors.Other updates include a Confidential mode, which allows the sender to set an expiration date for a sensitive message or to revoke it entirely, integrated rights management and two-factor authentication.
Users can enable or disable Labs features selectively and provide feedback about each of them.
In November 2011, Google began rolling out a redesign of its interface that "simplified" the look of Gmail into a more minimalist design to provide a more consistent look throughout its products and services as part of an overall Google design change.
Major redesigned elements included a streamlined conversation view, configurable density of information, new higher-quality themes, a resizable navigation bar with always-visible labels and contacts, and better search.
and was the first app on the Google Play Store to hit one billion installations on Android devices.
According to a 2014 estimate, 60% of mid-sized US companies, and 92% of startups, were using Gmail.