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The isotope $^{163}$Ho undergoes an electron capture process with arecommended value for the energy available to the decay, $Q_{\rm EC}$, of about2.5 keV. According to the present knowledge, this is the lowest $Q_{\rm EC}$value for electron capture processes. Because of that, $^{163}$Ho is the bestcandidate to perform experiments to investigate the value of the electronneutrino mass based on the analysis of the calorimetrically measured spectrum.  We present for the first time the calorimetric measurement of the atomicde-excitation of the $^{163}$Dy daughter atom upon the capture of an electronfrom the 5s shell in $^{163}$Ho, OI-line. The measured peak energy is 48 eV.This measurement was performed using low temperature metallic magneticcalorimeters with the $^{163}$Ho ion implanted in the absorber.  We demonstrate that the calorimetric spectrum of $^{163}$Ho can be measuredwith high precision and that the parameters describing the spectrum can belearned from the analysis of the data. Finally, we discuss the implications ofthis result for the Electron Capture $^{163}$Ho experiment, ECHo, aiming toreach sub-eV sensitivity on the electron neutrino mass by a high precision andhigh statistics calorimetric measurement of the $^{163}$Ho spectrum.

First Calorimetric Measurement of OI-line in the Electron Capture Spectrum of $^{163}$Ho