The invention relates to a portable, autonomous and secure micro-server (10) for collaboration between different users, comprising: a central processor (11); a random-access memory (12); a storage space (13) for computer files; an operating system (32) configured to be able to control said central processor (11), said random-access memory (12) and said storage space (13), characterized in that it further comprises: a first controller for wireless access to said micro-server, called the sharing network controller (14); a second controller for wireless access to said micro-server, called the configuration network controller (15); a management module (16) for managing packets from an IP network layer, said management module being embedded in said operating system (32) and configured to enable the use of a network service that enables files to be supplied from the storage space to a network service hosted by a device (21, 22) of a user connected to said micro-server via said sharing controller (15); a data encryption module (17), configured to be able to encrypt, using a predetermined encryption key, all the data passing through said random-access memory (12) before said data are saved in said storage space (13).