Thunderbird’s plans to expand beyond the desktop client took another step forward this month as the project published its latest progress report on Thunderbird Pro – the new Mozilla initiative to offer an open-source alternative to Gmail and Office 365, for which we informed you about at the beginning of April. Here’s where things stand so far.

Testing of Thundermail, the project’s email hosting service, has reached production level. Internal users have begun onboarding, allowing the team to validate account setup, support workflows, and delivery reliability. The refreshed Thundermail dashboard is also in place, giving users controls for custom domains, aliases, and account settings.