The “MusrROOT” have been used successfully for storing LEM data for many years. Since last year, all bulk muSR data have also been written in the new “MusrROOT” format, which offers many advantages including high time resolution, unlimited histogram length, well organized and modern structure providing a more complete information about experimental setup. This brings us one step closer to operating all muSR facilities at PSI using a single data acquisition system (DAQ) and the same data format. Therefor, starting November 2023, the search and fit tools on musruser.psi.ch will not support the old “PSI-BIN” and “PSI-MDU” formats. We recommend that all our users also avoid using these formats and adjust their software to work with “MusrROOT“.