The extremely fast rotation of millisecond pulsars is the outcome of a Gyr-long accretion phase onto a neutron star of material transferred through an accretion disc from a low mass late-type companion star. After this phase during which the binary shines as a bright low-mass X-ray binary (LMXB), the mass transfer rate declines allowing the activation of a radio/gamma-ray pulsar (MSP) powered by the rapid rotation of its magnetic field. The tight link between LMXBs and MSPs was first testified in 2009 by PSRJ1023+0038 that years before was in an accretion state. The recent suprising discovery of three binary systems, dubbed transitional MSPs, switching from accretion to rotation-powered emission and viceversa has shown the existence of a peculiar intermediate evolutionary phase during which LMXB and MSP states interchange on timescales compatible with those of the variations of the mass-inflow. Transitions were observed during outburst but also in an extremely peculiar sub-luminous disc state during which both accretion and ejection may take place. The main observational properties of known and candidate systems in both disc and disc-free states and ongoing efforts to understand the coupling of accretion and ejection and the role of magnetic fields in driving outflows will be presented
