Exchange on-premises | Exchange Online | Microsoft 365 | Active Directory | Azure Active Directory | Teams

IT-Services in the area of Microsoft Collaboration

Same but different




Consulting and project support on Active Directory, Exchange, and Office 365, e.g. implementing Office 365; consolidation of Active Directory and/or Exchange; migrations during company mergers or sales; optimizations or updates.


IT Architecture

Productions of technical architectural images, IST analyses and requirements catalogues, migration and coexistence concepts, migration planning and test cases.


System Engineering

After the concept work follows the implementation of the developed solutions, transfer to operations as well as operational support.


Powershell Scripting

Powershell scripts to support projects and operations with recurring tasks and processes.

We have high analytical and conceptual skills and get to the bottom of the matter. Uncomplicated but structured, coupled with extensive experience.

Projects carried out

Exchange and Active Directory Carve-Out, Office 365 Migration in a Hybrid scenario for a client in the energy industry.
(approx. 40.000 employees)
Implementing AD group policies based on BSI recommendations for Windows Server 2019, Windows 10 and Office 2019, client in public service.
(approx. 200 employees)

Exchange Online and Teams integration for a client in industry.
(approx. 5.000 employees)

Active Directory and Exchange Upgrade at an insurance company.
(approx. 400 employees)
Active Directory cleanup, implementing ADFS and Conditional Access for a client in services.
(approx. 1.000 employees)
Active Directory and Exchange consolidation for a client in public services.
(approx. 26.000 employees)
Supporting an Exchange outsourcing and consolidation project in public serves.
(approx. 70.000 employees)
Exchange outsourcing and consolidation project for a client in industry
(approx. 100.000 employees)
Exchange Upgrades for a non-profit company
(approx. 150 employees)
Mail migration projects and support for operations for a client in industry.
(appr. 250 Mitarbeiter)

Skills and knowledge

We have extensive knowledge in the following areas:
1 Years

We have 20 years of experience in consulting, IT architecture and system engineering. Agster IT GmbH has been in Düsseldorf since 2017.

1 %
satisfied customers​

Our customers are companies from various industries such as industry, finance, energy, public service and non-profit companies at home and abroad.

Smart changes with ease

On your way to the cloud, we support you with technical expertise, intellect, and sensitivity, from start to finish. Basically, there is an opportunity in every change – we are positive and with joy about changes.

About the company

Agster IT GmbH was founded in 2017 by Claudia Agster. She works as a senior system architect and system engineer and looks after customers at home and abroad.

I have supported a wide range of projects in enterprise companies (employees> 50,000) and I am very familiar with their processes and procedures. Also, I have continuously assisted an inclusive list of SMEs (from 50 employees) and non-profit organizations, who have benefited from my expertise. I bring technical and conceptual know-how to all our projects.

Claudia Agster

CO2 offset

We strive to keep CO2 emissions as low as possible and pay attention to CO2 neutral partners, products, and services in addition to green electricity, climate-conscious travel. With the help of “Klima ohne Grenzen” we have been measuring our CO2e annually since 2018 and supporting a compensation project in Uganda (CO2 offset of 21,36 tCO2e). In addition to environmental and social sustainability, these projects also promote the reduction of CO2 emissions. More information on this climate protection project.


We have the following certifications

IT security and data protection

We implement your IT solutions with the relevant data protection regulation (GDPR) and the BSI security recommendations in mind.
Do you have questions?
Stay in touch

Phone: +49 211 97532709

Rather Str. 25
D-40476 Düsseldorf