IIJ Document Exchange (DOX) is an enterprise online storage service operated by Internet Initiative Japan, designed for secure file exchange and distribution within and between companies. The service provides browser‑accessible storage with automatic server‑side encryption, high‑speed 10Gbps connectivity, and project‑level capacity management for corporate governance.

The platform addresses enterprise file sharing with emphasis on security, governance, and replacing PPAP email workflows. Strengths include granular project‑based access controls and capacity allocation, automatic conversion of email attachments into secure one‑time URLs, audit logging, and high‑speed infrastructure optimized for large files. IIJ Document Exchange primarily targets mid to large enterprises with strict security needs, project‑driven organizations needing file collaboration, companies modernizing PPAP email workflows, and regulated industries requiring audit trails.