IUE (International Ultraviolet Explorer), a satellite launched in January 1978 and still producing data, is equipped with a 45-cm telescope and two spectrographs for the range 1150 to 3200 Å, with resolutions of either 300 or 20,000. IUE led to the first modern astronomical data archive, and is also the first heavily used archive. Currently, all data requested from the archive corresponds to over 50 years of observing time, i.e. almost four times the actual mission duration. Three centers maintain a complete up-to-date copy of the IUE Archive: the NASA IUE archive at NSSDC (GSFC, USA), the ESA IUE archive at VILSPA (Spain), and the SERC IUE archive at RAL (UK). The plan is to have all IUE data remotely accessible in a final archive by 1994 (De La Peña et al. 1994). IUE Newsletter 41 (Oct. 1992) presents a merged observation log from 1978-1991 on microfiche. The observing log can be queried on-line: SET HOST VILSPA (28843), login as user VILSPA with password DB. The user is provided with a menu. Detailed usage of the system is described in the ESA IUE Newsletter 37 and an example of the scientific potential of the archive - when used systematically - is given by laDous (1994). The IUE Uniform Low Dispersion Archive (ULDA) is a uniform subset of the IUE archive, and is distributed by ESA/Vilspa. ULDA is available through national hosts, and futher information may be obtained from A. Talavera (VILSPA::AT or iuehot@esoc.bitnet). The ESA IUE Newsletter is published quarterly by ESA and NASA (contact iueobs@v3300.vilspa.esa.es or VILSPA::IUEOBS). [References: Wamsteker (1991), Ponz et al. (1992), laDous (1993).]