Attenda Limited
Cisco Systems Norway AS
Colt Telecommunications
Dante
Easynet Group Plc
Equinix (Services) Limited
Extreme Networks
France Telecom
Global Crossing (UK) Telecomms
Griffin Internet
Janet (UK)
KDLevel 3 Communications Ltd
DI Europe Ltd
London Internet Exchange Ltd
Milan Internet Exchange
MYNIC Berhad
Nominet UK Ltd
Research Machines plc
Ripe NCC
Spitfire Network Services Ltd
TalkTalk
Telecity
Telecom Italia Sparkle S.p.A
Tiscali International Network
Yahoo! UK Ltd
Aircom International Ltd
Alcatel
BT plc
Carphone Warehouse
Ericsson
Fujitsu Telecommunications Europe Limited
Gamma Telecom Ltd
Hutchison Team Telecom Ltd
Inmarsat
Intercall Conferencing Services Ltd
Manx Telecom
Mobily
Motorola
NextiraOne Belgium
Nokia Siemens Networks Nederland B.V
Nokia UK Limited
NTT Europe Ltd
Orange
Samsung Electronics UK Ltd
Siemens Enterprise Communications
Simobil Vodafone
Telecommunications Regulatory Authority
Telkom South Africa Ltd
T-Systems VICOS GmbH
Vodafone
XLN Telecom
BAE Systems
Boeing
British Airways Avionic Engineering
Cobham Defence Communications
Danish Defence Staff
EADS Astrium
ESOC
ESTEC
Federal Aviation Authority of Nigeria
General Dynamics
Ghana Civil Aviation Authority
Lockheed Martin Corporation
MOD
Norwegian Defence Accounting Office
QinetiQ Ltd
RAF
Royal Air Force of Oman
Selex Elsag Limited
Selex Galileo
Thales UK Ltd
Serco Defence Science & Nuclear
Surrey Satellite Technology
Arbor Networks
Atos Origin
Cap Gemini UK plc
Capita Business Services Ltd
Cisilion Limited
EMC Computer Systems
IBM UK Ltd
Invensys Systems (UK) Ltd
NEC Electronics Europe GmbH
Steria Ltd
Unisys
Zycko Limited
American Embassy
Audit Commission
DSTL
DEFRA
European Patent Office
Huntingdonshire District Council
General Record Office for Scotland
HM Government Communications Centre
HM Treasury
Home Office
Identity and Passport Service
Land Registry
National Audit Office
Office for National Statistics
United Nation Missions in Darfur
Bedfordshire County Council
Cambridgeshire County Council
Durham County Council
Gateshead Council
Ipswich Borough Council
Merthyr Tydfil County Borough Council
Royal Borough of Kensington & Chelsea
Somerset County Council
Tandridge District Council
Warwickshire County Council
Bayer
Genome Research Ltd
Institute of Cancer Research
Medical Imaging Group
NHS
Norvartis Pharmaceuticals UK Ltd
Philips Medical Systems
Sysmex UK Limited
Wyeth Pharmaceuticals
Arqiva
BBC
Economist Group
Latens Systems Ltd
Allied Irish Bank
Bank of America, N.A
Barclaycard
Deutsche Bank AG London
Gambia Revenue Authority
Hastings Insurance Services Ltd
HSBC Bank plc
Intelligent Finance
WorldPay Ltd
Accenture HR services
Amnesty International
Cadbury Schweppes
DHL
EnergiMidt
G4S
International Olympic Committee
Kingston University
London South Bank University
National Grid
NPOWER Yorkshire Ltd
RWE Systems UK Ltd
Shell IT International Ltd
University of Westminster
WesternGeco AS
Aker Subsea Limited
Berwin Leighton Paisner Ltd
Canon Europe Ltd
E.ON UK Grain Power Station
Europcar UK Ltd
Hurstpierpoint College
Kimberly-Clark European Services
Late Rooms.Com
Magnox Electric Ltd
NEC Electronics Europe GmbH
Oxford Brookes University
Saudi Aramco
SITA
United Utilities Networks Ltd
Amadeus
BOC
CGG Veritas
EDF Energy
Gas Transportation Company
Intercontinental Hotels Group
Nike
London College of Fashion
Metropolitan Police
New York Stock Exchange
RSPCA
Schlumberger Cambridge Research
TFL London
Waha Oil Company