[1] It was based on Prime minicomputers running Dialcom software under a customised version of PRIMOS.
The UK data centre was originally located in the basement of Beckett House 60-68 St Thomas St, Bermondsey, London, SE1 3QU but later moved to a custom built facility at Oxgate Centre, Oxgate Ln, London NW2 7JA which now houses LDEX1.
Instead, BT decided to launch a new Internet Service Provider, called BTnet, in 1994, and within two years, Mailbox had ceased to exist.
Users communicated using a noticeboard (noticebd) and via a simple chat facility which allowed real-time conversations to take place.
The BT Gold community was worldwide, but the majority of users were in London and would meet regularly at "eyeballs" (coined from CB usage).