The native, open-source Exchange drop-in replacement.https://grommunio.com/enhttps://grommunio.com/blog/coding-challenge-in-graz/https://grommunio.com/blog/coding-challenge-in-graz/At the Graz Linux Days, grommunio organized a highly acclaimed coding challenge that attracted many participants.Fri, 15 May 2026 00:00:00 GMThttps://grommunio.com/case-study/independent-and-resilient-grommunio-in-radolfshausen/https://grommunio.com/case-study/independent-and-resilient-grommunio-in-radolfshausen/“Independent and More Resilient”: grommunio at the Radolfshausen Municipality. More Municipalities are turning to the grommunio.Thu, 23 Apr 2026 00:00:00 GMThttps://grommunio.com/blog/graz-linux-days-2026-with-grommunio-talks/https://grommunio.com/blog/graz-linux-days-2026-with-grommunio-talks/Graz Linux Days 2026: grommunio presentations, workshops, and a coding challenge! Over 2,000 visitors made their way to Styria again in 2026.Thu, 16 Apr 2026 00:00:00 GMThttps://grommunio.com/news/grommunio-in-it-administrator-04-26/https://grommunio.com/news/grommunio-in-it-administrator-04-26/The renowned trade journal “IT-Administrator” has once again taken a close look at grommunio and reached a highly positive conclusion.Mon, 30 Mar 2026 00:00:00 GMThttps://grommunio.com/news/grommunio-at-graz-linux-days-2026/https://grommunio.com/news/grommunio-at-graz-linux-days-2026/As in previous years, grommunio will once again participate in the Graz Linux Days on April 10 and 11, 2026.Sun, 15 Mar 2026 00:00:00 GMThttps://grommunio.com/blog/exchange-without-protection/https://grommunio.com/blog/exchange-without-protection/Exchange without protection? From mid-October, MS Exchange administrators will no longer receive security patches, bug fixes or updates.Fri, 10 Oct 2025 00:00:00 GMThttps://grommunio.com/blog/digital-sovereignty-for-local-authorities/https://grommunio.com/blog/digital-sovereignty-for-local-authorities/The partnership between grommunio and Cancom SE, one of the largest IT system houses, is bearing fruit: digital sovereignty for local authorities.Wed, 08 Oct 2025 00:00:00 GMThttps://grommunio.com/news/newer-faster-more-efficient-grommunio-2025-01-1-is-here/https://grommunio.com/news/newer-faster-more-efficient-grommunio-2025-01-1-is-here/The new major release grommunio 2025.01.1: New operating system, significant speed improvements and lots of new features.Wed, 05 Feb 2025 00:00:00 GMThttps://grommunio.com/case-study/arbeitskreis-fuer-weiterbildung-landau-uses-grommunio/https://grommunio.com/case-study/arbeitskreis-fuer-weiterbildung-landau-uses-grommunio/The Arbeitskreis für Aus- und Weiterbildung Landau in der Pfalz e.V. (AAW) has successfully converted its almost 300 users to grommunio.Tue, 30 Jul 2024 00:00:00 GMThttps://grommunio.com/blog/grommunio-at-the-munich-tech-days/https://grommunio.com/blog/grommunio-at-the-munich-tech-days/grommunio at the Munich Tech Days. Markus Feilner will take part in the Closing Keynote on Thursday evening.Mon, 22 Jul 2024 00:00:00 GMThttps://grommunio.com/news/grommunio-improves-mailbox-performance/https://grommunio.com/news/grommunio-improves-mailbox-performance/grommunio improves mailbox performance, not only for all teams that work with shared mailboxes, an enormous increase in performance for all users.Wed, 19 Jun 2024 00:00:00 GMThttps://grommunio.com/blog/grommunio-at-suse-events/https://grommunio.com/blog/grommunio-at-suse-events/Presentations and networking: Meet grommunio experts at three events organized by SUSE, the world's largest Linux vendor.Tue, 11 Jun 2024 00:00:00 GMThttps://grommunio.com/blog/grommunios-exchange-web-services/https://grommunio.com/blog/grommunios-exchange-web-services/As of last year grommunio has been supporting Exchange Web Services (EWS). These services represent another important API.Mon, 22 Apr 2024 00:00:00 GMThttps://grommunio.com/news/new-cto-michael-kromer/https://grommunio.com/news/new-cto-michael-kromer/grommunio is pleased to announce the appointment of Michael Kromer as its new Chief Technical Officer (CTO).Mon, 08 Apr 2024 00:00:00 GMThttps://grommunio.com/blog/grommunio-at-the-chemnitzer-linux-days/https://grommunio.com/blog/grommunio-at-the-chemnitzer-linux-days/grommunio at the 25th Chemnitzer Linux-Days 2024, one of the most important German open source and community conferences.Tue, 19 Mar 2024 00:00:00 GMThttps://grommunio.com/blog/grazer-linux-days-2024/https://grommunio.com/blog/grazer-linux-days-2024/It's that time again: As every year, IT experts from all over Europe will meet on April 5 and 6 for the Grazer Linuxtage.Wed, 13 Mar 2024 00:00:00 GMThttps://grommunio.com/news/reinforcement-for-grommunio/https://grommunio.com/news/reinforcement-for-grommunio/Reinforcement for grommunio: Markus Feilner joined the grommunio team on March 1, bringing a wealth of experience with him.Mon, 11 Mar 2024 00:00:00 GMThttps://grommunio.com/blog/grommunio-fosdem-2024/https://grommunio.com/blog/grommunio-fosdem-2024/At the beginning of February this year, Jan Engelhardt from grommunio gave a presentation at FOSDEM in Brussels.Mon, 26 Feb 2024 00:00:00 GMThttps://grommunio.com/news/grommunio-release-2023-11-3/https://grommunio.com/news/grommunio-release-2023-11-3/grommunio Releases Version 2023.11.3: Unveiling Full EWS Support and Enhanced Features for a Seamless Communication Experience.Fri, 02 Feb 2024 00:00:00 GMThttps://grommunio.com/blog/fosdem-brussels-2024/https://grommunio.com/blog/fosdem-brussels-2024/Our Lead Software Architect Jan Engelhardt will talk about the implementation of 27 MS Exchange protocols & APIs at FOSDEM.Thu, 01 Feb 2024 00:00:00 GMThttps://grommunio.com/blog/three-years-later-more-from-grommunio/https://grommunio.com/blog/three-years-later-more-from-grommunio/The third year was also extremely successful for the leading open source groupware: in 2023, we have implemented this continuously.Thu, 11 Jan 2024 00:00:00 GMThttps://grommunio.com/blog/thanks/https://grommunio.com/blog/thanks/Sending you heartfelt thanks and our gratitude for your continued support over the past year. Thanks!Mon, 18 Dec 2023 00:00:00 GMThttps://grommunio.com/news/presentation-of-grommunio-2023-11-1/https://grommunio.com/news/presentation-of-grommunio-2023-11-1/Presentation of grommunio 2023.11.1, a groundbreaking update that consolidates the company's position as the leading open source groupware platform.Mon, 20 Nov 2023 00:00:00 GMThttps://grommunio.com/news/open-source-collaboration/https://grommunio.com/news/open-source-collaboration/grommunio is proud to play a significant role in OSC (Open Source Collaboration) and thus in the future vision of Telekom.Tue, 12 Sep 2023 00:00:00 GMThttps://grommunio.com/blog/three-years-grommunio/https://grommunio.com/blog/three-years-grommunio/Three years ago, on a blazing hot Viennese summer day in August 2020, grommunio was launched.Wed, 02 Aug 2023 00:00:00 GMThttps://grommunio.com/blog/grommunio-packages-in-opensuse-factory/https://grommunio.com/blog/grommunio-packages-in-opensuse-factory/grommunio packages can now also be found in openSUSE Factory as well as in Tumbleweed. Our CMO was at SUSECON 2023.Thu, 22 Jun 2023 00:00:00 GMThttps://grommunio.com/news/exchange-activesync-16-fully-integrated/https://grommunio.com/news/exchange-activesync-16-fully-integrated/grommunio has now fully integrated Exchange ActiveSync 16.0 and 16.1 into grommunio Sync - with improvements in the Admin Panel and MDM.Mon, 24 Apr 2023 00:00:00 GMThttps://grommunio.com/blog/relax-and-unleash-the-power-of-open-source/https://grommunio.com/blog/relax-and-unleash-the-power-of-open-source/"Relax and Unleash the Power of Open Source" - a guest article by Markus Feilner, Consultant for open source strategies.Mon, 20 Mar 2023 00:00:00 GMThttps://grommunio.com/blog/the-grommunio-workplace/https://grommunio.com/blog/the-grommunio-workplace/With grommunio you provide your teams with a secure, sovereign and self-determined workplace - without vendor lock-in.Thu, 02 Mar 2023 00:00:00 GMThttps://grommunio.com/blog/worlds-first-multi-ldap-groupware/https://grommunio.com/blog/worlds-first-multi-ldap-groupware/Multi-LDAP, multi-tenant architecture, audit-proof authentication: grommunio is tailored for large environments and hosters.Fri, 17 Feb 2023 00:00:00 GMThttps://grommunio.com/blog/exchange-your-exchange/https://grommunio.com/blog/exchange-your-exchange/Even in 2023, Microsoft Exchange customers are under massive pressure - remedy: Exchange your Exchange. Switch to grommunio now.Fri, 10 Feb 2023 00:00:00 GMThttps://grommunio.com/blog/aapips-admin-api-for-powershell/https://grommunio.com/blog/aapips-admin-api-for-powershell/The Powershell admin interface "Admin API for Powershell" AAPIPS gives Microsoft admins direct access to the grommunio Admin API.Thu, 26 Jan 2023 00:00:00 GMThttps://grommunio.com/blog/grommunio-desktop-the-groupware-client/https://grommunio.com/blog/grommunio-desktop-the-groupware-client/Among the many changes that grommunio version 2022.12.1 brings, one feature in particular stands out: grommunio Desktop.Fri, 20 Jan 2023 00:00:00 GMThttps://grommunio.com/blog/2022-a-success-story/https://grommunio.com/blog/2022-a-success-story/2022 brought grommunio a lot of media attention and new partnerships, including T-Systems and the Upgrade to Linux initiative.Thu, 05 Jan 2023 00:00:00 GMThttps://grommunio.com/news/grommunio-2022-12-1-released/https://grommunio.com/news/grommunio-2022-12-1-released/grommunio 2022.12.1 is available now and offers a long list of new features, updates and bug fixes.Sat, 24 Dec 2022 00:00:00 GMThttps://grommunio.com/blog/grommunio-says-thank-you/https://grommunio.com/blog/grommunio-says-thank-you/Another year has passed in the history of grommunio, and we want to take this opportunity to say thank you.Mon, 19 Dec 2022 00:00:00 GMThttps://grommunio.com/news/upgrade-to-linux/https://grommunio.com/news/upgrade-to-linux/Upgrade to Linux initiative: grommunio, Linux Professional Institute, Tuxedo Computers and Linux Magazine work together.Mon, 21 Nov 2022 00:00:00 GMThttps://grommunio.com/blog/another-remote-code-execution-in-ms-exchange/https://grommunio.com/blog/another-remote-code-execution-in-ms-exchange/Another Remote Code Execution in MS-Exchange: With high severity in the Common Vulnerability Score System - CVE-2022-41040 and CVE-2022-41082.Mon, 10 Oct 2022 00:00:00 GMThttps://grommunio.com/blog/stay-compatible/https://grommunio.com/blog/stay-compatible/Stay compatible! grommunio not only supports Outlook 2013-2021, but also offers many improvements and benefits.Wed, 21 Sep 2022 00:00:00 GMThttps://grommunio.com/news/new-release-grommunio-2022-05-2/https://grommunio.com/news/new-release-grommunio-2022-05-2/New Release: grommunio 2022.05.2 - PHP 8.1, topic search, 22 languages and improved Public Folders: a long list of highlights.Mon, 12 Sep 2022 00:00:00 GMThttps://grommunio.com/blog/open-source-software-community/https://grommunio.com/blog/open-source-software-community/It is a great advantage for our partners, customers and admins as well as developers that grommunio is part of the open source software community.Thu, 28 Jul 2022 00:00:00 GMThttps://grommunio.com/news/t-systems-is-platinum-partner/https://grommunio.com/news/t-systems-is-platinum-partner/T-Systems is a Platinum Partner that will launch the "OpenSource Collaboration" software with grommunio on the Open Telekom Cloud.Wed, 25 May 2022 00:00:00 GMThttps://grommunio.com/news/grommunio-appliance-2022-05-1-released/https://grommunio.com/news/grommunio-appliance-2022-05-1-released/grommunio Appliance 2022.05.1 is now available and offers a long list of new features, updates and bug fixes.Wed, 18 May 2022 00:00:00 GMThttps://grommunio.com/news/grommunio-in-it-administrator-05-22/https://grommunio.com/news/grommunio-in-it-administrator-05-22/In the new IT Administrator 05/22 with the article "Migration from Exchange to grommunio", we describe this topic clearly.Thu, 05 May 2022 00:00:00 GMThttps://grommunio.com/news/linux-magazin-04-22-market-comparison/https://grommunio.com/news/linux-magazin-04-22-market-comparison/The Linux-Magazin 04/22 is available for a short time and grommunio has made it again on the DVD included in the magazine.Thu, 17 Mar 2022 00:00:00 GMThttps://grommunio.com/news/release-of-grommunio-appliance-2021-08-3/https://grommunio.com/news/release-of-grommunio-appliance-2021-08-3/grommunio appliance 2021.08.3 has just been released as scheduled. This is a minor release with significant improvements.Wed, 16 Feb 2022 00:00:00 GMThttps://grommunio.com/news/grommunio-in-linux-magazine-02-22/https://grommunio.com/news/grommunio-in-linux-magazine-02-22/As of last week the Linux-Magazine 02/22 is available, which has grommunio on the cover, as well as in an article and on the DVD.Tue, 18 Jan 2022 00:00:00 GMThttps://grommunio.com/news/change-now/https://grommunio.com/news/change-now/Change to grommunio now - on your terms! We offer the same conditions that you pay with your current service providerFri, 07 Jan 2022 00:00:00 GMThttps://grommunio.com/blog/a-good-vintage/https://grommunio.com/blog/a-good-vintage/At the end of 2020, the founder of grommunio laid the foundation. One year later, we look back on a successful year - A good vintage.Wed, 29 Dec 2021 00:00:00 GMThttps://grommunio.com/news/5-open-source-alternatives-to-microsoft-exchange/https://grommunio.com/news/5-open-source-alternatives-to-microsoft-exchange/On November 24, Open Source Way reported on grommunio again. ‘5 open source alternatives to Microsoft Exchange’.Wed, 24 Nov 2021 00:00:00 GMThttps://grommunio.com/news/announcing-grommunio-appliance-2021-08-2/https://grommunio.com/news/announcing-grommunio-appliance-2021-08-2/We are pleased to announce the release of grommunio appliance 2021.08.2 for 24 November via our website.Thu, 18 Nov 2021 00:00:00 GMThttps://grommunio.com/news/open-source-magazine-news/https://grommunio.com/news/open-source-magazine-news/The Open Source Magazine reported on 24 September under the heading: 'An open source alternative to Microsoft Exchange' about grommunioFri, 24 Sep 2021 00:00:00 GMThttps://grommunio.com/news/heise-online-news/https://grommunio.com/news/heise-online-news/Heise Online reported on 13 August under the heading: ‘grommunio, formerly grammm: New release of the free Exchange alternative’.Fri, 13 Aug 2021 00:00:00 GMThttps://grommunio.com/blog/announcement-of-release-2021-08-1/https://grommunio.com/blog/announcement-of-release-2021-08-1/Announcement release Appliance 2021.08.1 on 17 August. This is our most comprehensive release to date and includes new features and fixes.Thu, 12 Aug 2021 00:00:00 GMThttps://grommunio.com/news/grammm-becomes-grommunio/https://grommunio.com/news/grammm-becomes-grommunio/grammm becomes grommunio - due to the phonetic similarity to a US company, we decided on a new name.Thu, 22 Jul 2021 00:00:00 GMThttps://grommunio.com/news/video-commercial-released-what-is-grammm/https://grommunio.com/news/video-commercial-released-what-is-grammm/Today we have our first video commercial "What is grammm?" published on our YouTube channel. It's worth a visit!Fri, 28 May 2021 00:00:00 GMThttps://grommunio.com/news/release-of-the-grammm-appliance-2021-02-2/https://grommunio.com/news/release-of-the-grammm-appliance-2021-02-2/We are pleased to announce the release of the grammm appliance 2021.02.2 and thank you in all forms for the feedback!Mon, 17 May 2021 00:00:00 GMThttps://grommunio.com/news/statement-grammm-to-kopano/https://grommunio.com/news/statement-grammm-to-kopano/On 7 April, Kopano made a public statement on their homepage accusing grammm of copyright infringement.Wed, 07 Apr 2021 00:00:00 GMThttps://grommunio.com/news/ct-magazine-news/https://grommunio.com/news/ct-magazine-news/On 26-March, c`t magazine reported on grammm - text excerpt: "We spoke to the grammm developers...Tue, 30 Mar 2021 00:00:00 GMThttps://grommunio.com/news/update-of-the-grommunio-appliance-published/https://grommunio.com/news/update-of-the-grommunio-appliance-published/grammm publishes update of the installation medium of the grammm appliance 2021.02.1 from 17 March brings some innovations.Fri, 19 Mar 2021 00:00:00 GMThttps://grommunio.com/blog/vulnerabilities-in-ms-exchange-grammm-offers-a-safer-alternative/https://grommunio.com/blog/vulnerabilities-in-ms-exchange-grammm-offers-a-safer-alternative/grammm offers a safer alternative to MS Exchange. The BSI has announced that four vulnerabilities in MS Exchange have been closed.Wed, 17 Mar 2021 00:00:00 GMThttps://grommunio.com/news/big-discounts-for-education-research-and-the-public-sector/https://grommunio.com/news/big-discounts-for-education-research-and-the-public-sector/Users from the fields of education, research, the public sector, authorities, governments and non-profits receive high discounts.Tue, 16 Mar 2021 00:00:00 GMThttps://grommunio.com/news/heise-online-news-demo-released/https://grommunio.com/news/heise-online-news-demo-released/Heise Online reported on grammm. In addition to the demo, there is now the option of installing grammm on your own server.Mon, 01 Mar 2021 00:00:00 GMThttps://grommunio.com/news/roadmap-published-for-12-months/https://grommunio.com/news/roadmap-published-for-12-months/Roadmap published for the next 12 months The next major release is planned for August 2021 as version 2021.08.Mon, 22 Feb 2021 00:00:00 GMThttps://grommunio.com/news/product-expanded-to-include-grammm-mdm/https://grommunio.com/news/product-expanded-to-include-grammm-mdm/Product expanded to include grammm MDM. The grammm Mobile Device Management (MDM) enables the management of connected mobile devices.Mon, 08 Feb 2021 00:00:00 GMThttps://grommunio.com/news/performance-benchmarks/https://grommunio.com/news/performance-benchmarks/In a performance benchmark, grammm has a performance that is 5 times faster than Microsoft Exchange.Mon, 25 Jan 2021 00:00:00 GMThttps://grommunio.com/news/welcome-martin-witte/https://grommunio.com/news/welcome-martin-witte/We warmly welcome Martin Witte as Chief Sales Officer at grammm and look forward to his many years of experience.Mon, 04 Jan 2021 00:00:00 GMThttps://grommunio.com/blog/thanks-to-all-customers-and-partners/https://grommunio.com/blog/thanks-to-all-customers-and-partners/Thanks to all customers and partners. After an eventful and busy year, we wish you a Merry Christmas and a Happy New Year.Mon, 21 Dec 2020 00:00:00 GMThttps://grommunio.com/news/launch-partner-portal/https://grommunio.com/news/launch-partner-portal/Our partner portal is live, so customers and partners have a portal on which licenses can be purchased and edited.Mon, 07 Dec 2020 00:00:00 GMThttps://grommunio.com/news/product-extended-by-grammm-files/https://grommunio.com/news/product-extended-by-grammm-files/Product extended by grammm Files. Files stores data in its own infrastructure - as a cloud solution according to the customer's rules.Sat, 28 Nov 2020 00:00:00 GMThttps://grommunio.com/news/presentation-of-the-partner-pro-grammm/https://grommunio.com/news/presentation-of-the-partner-pro-grammm/As a sales partner, you too can benefit from these growth opportunities and the excellent possibilities of the “Partner-pro-grammm“.Mon, 09 Nov 2020 00:00:00 GMThttps://grommunio.com/news/grammm-presents-the-product-portfolio-and-prices/https://grommunio.com/news/grammm-presents-the-product-portfolio-and-prices/grammm presents its product portfolio and prices. The business model is based on the provision of support services.Mon, 26 Oct 2020 00:00:00 GMThttps://grommunio.com/blog/beta-version-of-the-video-platform-available/https://grommunio.com/blog/beta-version-of-the-video-platform-available/The first beta version of the video platform is available with grammm Meet. No installation on the client is required for use.Mon, 05 Oct 2020 00:00:00 GMThttps://grommunio.com/news/beta-version-available/https://grommunio.com/news/beta-version-available/grammm is now available as a beta version. The first open source solution that offers fully functional OutlookAnywhere (RPC over HTTP).Mon, 28 Sep 2020 00:00:00 GMThttps://grommunio.com/news/grammm-gmbh-starts-business-operations/https://grommunio.com/news/grammm-gmbh-starts-business-operations/grammm GmbH in Vienna starts business operations. Norbert Lambing, Victor Tesla and Mike Williams are working on an open source platform.Tue, 01 Sep 2020 00:00:00 GMT