An open source platform for everyone, that is the innovative idea.

Behind every good project there is a strong team: We got together in 2019 to make our idea of an open source platform a reality. With the exigencies of the global pandemic in early 2020, we were encouraged to find an alternative to centralized proprietary software solutions in foreign jurisdictions and isolated open source vendors. It was a challenge we were happy to take on:

With grommunio it no longer matters how many communication channels you use. The inefficiency of context changes in communication is a thing of the past with grommunio. At the same time, grommunio creates a high level of privacy and security for one of your most valuable goods: your data. Decide for yourself where your data is stored – on your computer or off-site.

grommunio has committed itself to the following corporate principles

The most progressive solution in the area of communication and collaboration: grommunio, as an open source alternative, offers a platform for EVERYONE!

Customer orientation

With easy-to-use technology to your success: We have developed grommunio for you to optimize your performance.


grommunio keeps your technical effort as low as possible – and stands out from a multitude of complex technologies.


A robust component architecture and the highest standards of development quality ensure that our codes will last.


Nobody is perfect – certainly we are not. We have made it our goal to improve with each passing day.


Your most valuable asset in the digital age: your data. grommunio helps you to protect your data. By making our platform completely open source, independent IT professionals are available to assist you.


grommunio was developed to make your digital life easier. You can expect fast, straightforward help – with no strings attached.


Let’s go on a journey through the digital universe together – you can trust us as professionals, we are always there to support you.

This is what distinguishes grommunio

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grommunio offers a wide range of interfaces … for optimal integration in a variety of environments.

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As the first open source solution – with a fully functional implementation of Outlook Anywhere (RPC-over-HTTP) and MAPI-over-HTTP, grommunio is the alternative to proprietary backends for native interoperability with Microsoft Outlook.

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With its efficient and optimized design, it even outperforms its proprietary counterparts in most areas.

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With the Linux platform as the basis, and the associated scalability and manageability, grommunio convinces with its large variety of implementation scenarios in your data center.

The management team

Norbert Lambing – CEO

Norbert is CEO and founder of grommunio. Through his sports career at Olympic level, he knows exactly what skills it takes to succeed in a competitive world. Having won numerous championships and trophies, he has proven that he can shape teams – and tease out the strengths of each individual in the process.

He doesn’t admit it, but he’s our personal version of the non-migrant Styrian oak – only as a Viennese.

Martin Witte – CSO

As CSO, Martin ensures that we can live from our passion for grommunio. Thanks to his many years of experience at C-level in industry and in the support of government agencies and associations, Martin’s two qualities are particularly convincing: efficiency and professionalism.

His credo: Never leave home without a suit!

Why should you choose grommunio?

Let’s start with a few counter-questions – the answers may then come up on their own:

– How many communication channels do you use every day?

Imagine a communication platform with multiple communication paths – regardless of the device you use.

– Can you trust your communication channels for security and privacy?

Do you know in which location or country your data is centrally stored and who potentially has access to your data?

– What are your past expenses when it comes to your communication platforms?

Do you know all the costs involved, including software licenses, software subscriptions, service costs and maintenance fees, etc.?

– How was your experience with your previous communication solutions during the increased requirements of the 20/21 pandemic?

Were you satisfied with the ease of use, speed, stability – and did you have a positive overall experience with all applications working together?

– How would you rate productivity in terms of communication needs?

How much time and effort is required to collect all the data from the various communication channels – as well as when using the various work tools?