Do you already have or plan to have systems other than Siebel in place which need to talk to Siebel regularly in one way or the other?
If you answered Yes to the question above, you need a Siebel Integrated solution which talks to the other systems (ERP/SAP, Billing, Email / SMTP, etc.) maybe in Real-time or as a nightly load to ensure that the same data is maintained across all applications in your enterprise.
Mauve Technologies has extensive, and unmatched experience in Siebel Enterprise Applications Integration. Our professionals have worked on many different simple/complex Implementations integrating with Middlewares, set-up Web Services based interaction, SMTP Server synchronizations, etc.
At times the Integration need is not straight away, and may need some thinking. Talk to Mauve Experts to see how your entire ecosystem of disparate applications can work in tandem with each other such that you as an organization can leverage the Best features of them all.