An information exchange method and apparatus, a device, and a medium are provided. Said method comprises: receiving, from a sharing party, a sharing request for sharing a target mail; and creating, in response to the sharing request, an instant messaging IM group comprising the sharing party and a shared party at an IM end, displaying a discussion interface corresponding to the IM group at a mail end, and sharing the target mail with the shared party, to enable information exchange between the sharing party and the shared party in the IM group and/or in the discussion interface based on the target mail.