Malta has seen huge public and private-sector investment in ICT over the past 15 years, and today has a state-of-the-art infrastructure. GO, Melita and Vodafone are the three main telecoms service providers, while Malta hosts more than 200 IT companies, including international giants such as Microsoft, Oracle and Cisco. The island is internationally connected via four submarine fibre-optic links to mainland Europe, two of which are operated by GO and two by Vodafone and Melita respectively. This system is backed up by two satellite stations. Data centres are operated by the telecoms operators with their own fibre-optic cables, and also by other, smaller telecoms companies. Fixed broadband is available via cable and ADSL, each with national coverage. The main postal provider is MaltaPost. Delivery is efficient and reliable, with a three-day service to most mainland European cities. Local mail is delivered the following working day. All the main international courier services are represented on the island.