The spectroscopic legacy of XMM-Newton after more than 20 years

The EU funded XMM2Athena project aims at developing and testing new methods and software to allow the community to follow the X-ray transient sky in quasi-real time, identify multiwavelength/messenger counterparts of the sources detected with XMM-Newton and determine their nature using advanced machine learning methods and probe the faintest sources using innovative stacking and detection algorithms. Within this project we developed software to perform automated fits based on a Bayesian approach. We did spectral fits of the 319565 detections with spectra in the 4XMM-DR11 catalogue using a simple absorbed powerlaw model. Furthermore, we fit combined spectra for the 30325 sources that have been observed more than once, based on the XMM-Newton stacked catalogue, using an absorbed powerlaw as well as an absorbed blackbody model. We performed quality checks and investigated the distributions of the spectral parameters. Here we will present the results of our efforts and promote our catalogues to encourage the community to make use of them.