Ray Titcombe, chairman of council at the IBM Computer Users' Association, said, "These three topics have consistently come out as the issues that our members and their boards are most concerned about, particularly security.
"Most systems are now being opened up to internet front-ends and corporate alliances - concern about security is a natural follow-on from this."
Jointly organised by the IBM CUA and the Common User Groups, the conference follows the January relaunch of the iSeries server range, which was formerly known as the AS/400.
With about 12,000 AS/400 and iSeries machines currently in the UK, Titcombe believes that 2003 will be an important year for IBM mid-range customers.
He said, "I think this is going to be a decisive year - it is a point in time where the iSeries either retains its identity within IBM's eServer range of products or just fades away.
"I think, however, that the iSeries will come out as a strong brand that the IBM people realise that they cannot lose."
Other key topics under discussion at the iSeries Symposium include web services and storage, particularly implementing the iSeries into a storage area network.
Titcombe said, "So many document management, image management and data-hungry applications are now becoming commonplace that a large number of iSeries sites have a great need for storage."