In disaster and crises management authority teams, operational as well as administrational, specific and often customized software products are available and in use. As this kind of software is not operated on a regular base and only under specific, ad-hoc and stressful circumstances, intensive and recurring training effort is required for all involved users. For authorities as well as staff, sometimes being called for their role from different business background, this is a significant challenge. Due to time restrictions it often is not possible to keep everyone fully trained and up to speed in the usage of those software products.The theme of this thesis was to evaluate if and how standard office software products may be used and which situation specific functionality would need to be developed and implemented as an add-on.For this evaluation and the requirements and needs assessment, based on the methodology of “requirements engineering”, interviews with involved stakeholders from disaster management authorities have been conducted. Based on the feedback received a conceptual and sample model for a Microsoft Outlook add-on has been developed and realized as a Visual Studio add-in.With this add-on it now is possible to use Outlook, a wide spreaded and well-known application people are used to work with, as a tool for disaster management duties. Users are trained from their day to day jobs in the use of this application and its standard functionalities, while the indispensable specific needs are covered on top.Such an extension to a standard application is reducing training effort and is making users more comfortable in the usage of the tool in crises situations. It can be implemented in the same way on different disaster management authority levels.