United Hoster

United Hoster operates as a hosting provider with its headquarters located in Germany. The company's core service offering includes Hosted Exchange, a managed email and collaboration platform built on Microsoft Exchange technology. This service is targeted at business customers, providing them with a cloud-based solution for email, calendars, and contacts, thereby eliminating the need for organizations to maintain their own on-premises Exchange servers. By delivering this infrastructure as a service, United Hoster functions within the broader IT outsourcing and cloud services market, catering primarily to small and medium-sized enterprises that seek reliable, third-party-managed communication tools. The operational scope is centered on maintaining the security, availability, and performance of these hosted environments for its client base.

The company's operational profile and technical competencies were notably highlighted during a significant security incident on May 20, 2023. United Hoster suffered a ransomware attack that specifically encrypted its Hosted Exchange servers, with the mail databases being the primary target, which resulted in a complete service outage for its customers. An internal investigation determined that the attackers gained initial access by exploiting an unknown, previously unpatched vulnerability within the Microsoft Exchange software itself. This detail underscores the company's reliance on and integration of complex Microsoft server infrastructure into its service stack. In its public statement following the attack, United Hoster reported that there was no evidence of data exfiltration and that no ransom demand was received, suggesting the attackers' motive was purely disruptive encryption. The company's response involved implementing immediate countermeasures to contain the breach, formally notifying law enforcement authorities, and proactively providing affected customers with an alternative, temporary mail solution while a new, secure Exchange environment was constructed and brought online. This incident illustrates the critical nature of the infrastructure United Hoster manages and its procedural approach to major service disruptions and cybersecurity events.