In 2018, we replaced an outdated administration and invoicing program with Lexware. On the one hand, a logical connection to the old article and customer master had to be maintained, and on the other hand, processes were to become leaner and evaluations more comprehensive. Another challenge was that the municipal utilities are both a plumbing and an electrical company. Thanks to the competent, foresighted and patient support of the LX EXPERTs, the conversion was successfully completed. With additional tools to Lexware, we now obtain complex evaluations effortlessly.