Customers of PWI since 1987
| Abbey Life | Informix |
| Alcan | Inland Revenue |
| American Express | Kuwait Petroleum |
| ANZ Grindlays | Lever Brothers |
| Avaya | Lloyds TSB |
| Ballast Nedam | Marley Plc |
| Bass | Mars |
| BAT | National Health Service Trusts |
| BT | Oxfam |
| Business Objects | Prudential Assurance |
| Canada Life | Searchspace |
| Chase Manhattan | Sequent Computer |
| Chemical Bank | Shell International |
| Ciba Geigy | Sitex-Orbis |
| Citibank | Storage Technology Corporation |
| Data General | Stratus Computers |
| Dell Computers | Wavin bv |
| F5 Networks | West Midlands Ambulance |
| ICL | Willis Corroon |
| IDV |