Gmail Offline is a discontinued Chrome extension (and therefore not available for Windows standalone) that allowed users to access and manage their Gmail even without an internet connection. It worked by caching emails and allowing basic actions like reading, replying, searching, and composing emails offline. Once an internet connection was restored, changes made offline were synchronized with the Gmail servers.

However, it[SQ]s important to note that Google officially discontinued Gmail Offline in 2022.

The extension is no longer supported and will not function correctly. Therefore, there[SQ]s no current way to use the official Gmail Offline application on Windows or any other platform.