The information necessary to provide a comprehensive answer is not held centrally, as Foreign and Commonwealth Office (FCO) departments are responsible for their own budgets; to collate the information requested by my hon. Friend would incur disproportionate cost.
However, the providers of corporate software in use across the FCO network include Microsoft (desktop operating system and office automation), Oracle (financial and human resources), McAfee (anti-virus), Adobe (portable document reader), Citrix (web-based applications) and Hewlett-Packard, Sophos, Mailmarshall and Clearswift (network management).
Many other software products are in use to meet specific functional needs in the UK and at posts overseas.