Oracle's US$5.85 billion acquisition of Siebel is set to close Tuesday following a vote by Siebel shareholders. The two companies agreed to the deal in September.

To date, the disposition of Siebel products and technologies, such as its Business Analytics tools and the OnDemand hosted CRM offering, remains unresolved.

Oracle declined to comment for this story, stating that it would prefer to wait until the deal closes. But following the move to buy Siebel, Oracle executives had expressed interest in some of its offerings, including OnDemand, which is hosted on systems from rival IBM.

Despite the lack of a firm plan from Oracle executives, six Siebel users said they are still either upbeat or neutral about the deal. Three said they don't anticipate immediate benefits because they expect the integration of the companies and products to be a complex, long-term project.

"I think this integration is going to take a while," said Mike Thyken, CIO at Select Comfort Corp., a Minneapolis-based mattress retailer that runs the Oracle E-Busines Suite 11i and is installing Siebel's analytics application.