We’ve heard from customers that they want to use the same Gmail app whether they’re online or off. Our new offline feature makes that possible, allowing you to search, write, delete, and archive up to 90 days of messages, even when you don’t have an internet connection.

This native capability is easier to use and performs better than the Gmail Offline Chrome app, so we’re removing it from the Chrome Web Store after December 3rd, 2018. This is part of our ongoing effort to move Chrome apps to the web.

In preparation, we recommend that affected G Suite admins who want to preserve offline access enable Gmail web offline for their domains and then encourage their users to do the following:

1. Enable Gmail offline in their individual settings.
2. Uninstall the Gmail Offline Chrome app.

To access Gmail while they’re offline, users should simply navigate to mail.google.com in a Chrome browser (v61 or higher).

Please note that you can only use the native Gmail offline feature in the new Gmail.

More Information
G Suite Updates blog: Work offline in the new Gmail
Help Center: Work offline in Gmail
Help Center: Use Gmail offline

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Source: G Suite Updates Blog