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Although the open-source software (oss) adoption is highly discussed in public, the same topic has not drawn much intention in research. This work is closing the gap by presenting a detailed analysis of open-source software adoption. We construct a new model to explain the adoption of oss within this paper. Therefore, we do a meta-analysis of established oss migration studies and identify the factors which are influencing the decision to adopt oss in companies. To evaluate this model we perform a case study. The statistical results of this study are also used to classify and compare the influencing factors and the case study's participants.