We are grommunio, a software company (and community) based in Vienna, Austria.

With grommunio it no longer matters how many communication channels you use. The inefficiency of context switches in your team’s communication is a thing of the past with grommunio. At the same time, grommunio provides highest levels of privacy and security for one of your most valuable goods: your data.

Decide for yourself where your data is stored – at home, on your server, in your data center or in a public cloud.

grommunio runs with just a single user up to many hundreds of thousands of users, from a Raspberry Pi to mainframes or even geo-split installations distributed all over the world.

grommunio is unique: it is drop-in compatible with Microsoft Exchange, providing all relevant messaging protocols to its open source and prorietary clients such as Microsoft Outlook without the installation of MAPI extensions on the client. grommunio is even compatible with Outlook 2010 and 2013, though it is not recommended to still run these old versions anymore.

grommunio would not be possible without free and open source software. We believe in open source — we believe it is important for both, our society and organizations. With the right team, you accomplish a lot and add value to the community.

At grommunio, we greatly value the support of IT security researchers and members of cybersecurity communities in helping us to maintain our high IT security standards.

If you identify a security vulnerability relating to any of our products, please notify us promptly before disclosing the vulnerability to the outside world, so that we can take the necessary measures. This is known as responsible disclosure.

If you have identified a security vulnerability, please send us your notification as soon as possible via email to [email protected].

Support is available through grommunio GmbH and its partners. For commercial options, check out https://grommunio.com.