The advice follows Oracle's success in having an antitrust case brought by the US Department of Justice thrown out of court earlier this month.
The Department of Justice had raised concerns about Oracle's protracted, hostile takeover bid for PeopleSoft.
Although the bid still has to be approved by the EC and the PeopleSoft board and shareholders, it now looks more likely to succeed. That could leave PeopleSoft users with a choice between migrating to Oracle or seeking support elsewhere.
PeopleSoft users in the UK include Bupa, Tesco, Safeway, Dixons, Nissan and Abbey. Oracle has promised to support PeopleSoft users for the next 10 years and would offer Oracle applications and databases for no charge.
But George Lawrie, senior analyst at Forrester, said if an Oracle takeover became imminent PeopleSoft uses should consider grouping together to canvas the market for external support. This would strengthen their hand if Oracle tried to force a migration to its technology, he said.
Lee Geishecker, research vice-president at Gartner, said the aim of Oracle's move for PeopleSoft was to acquire market share and users, rather than technology.
Those most at risk from the takeover would be users running JD Edwards software on IBM AS/400 servers, Geishecker said. "This is the big question. Will IBM work with Oracle in supporting this?" she said.
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