Denver – Microsoft CEO Steve Ballmer said traditional enterprise software is the here and now, but partners and end-users should start preparing for a world that will meld software and services. Ballmer laid out a roadmap for the future, not only for Microsoft but for all of the partners that build software on top of the Windows platform, during his keynote at the company’s annual Worldwide Partner Conference.

He said traditional software will continue to generate the bulk of sales revenue, but that a software-plus-services world is not far behind.

Ballmer began his keynote by circulating among the crowd shaking hands and clapping to build excitement. He then jogged to the stage where he huffed and puffed and bellowed the virtues of the 8,000 gathered partners.

His message was for everyone to get on the software-plus-services bandwagon, Microsoft’s version of the software-as-a-service trend now dominating industry hype.

In terms of the beginning of this new era, Ballmer said the time is now.

“We as a company are innovating, writing new software; we will be out with beta and design previews and we will be looking for feedback. The time to engage is now.”

He said the future would include elements of today’s technology combined with new service models of the future.“We need the best of the desktop, the best of the enterprise and the best of the online world. We need to bring together rich user interfaces, offline and online access, and what I call personal integration to go in and bring things together, integrate them, store them and link them together in unique and arbitrary ways.”

Ballmer said a good example today is Exchange and Outlook.

“Outlook is a rich client app. Outlook Web Access is an Ajax app that looks exactly the same, talks to the same backend. Office Outlook Mobile is a device form factor, and Office Outlook voice access makes this successful even vs. the telephone. And as Exchange has moved out to live in a hosted form it is moved to use HTTP protocols and is perhaps the closest model we have, I think, to what people will really want in the future. That is the user interface side.”

Ballmer then went on to demonstrate Silverlight, Microsoft’s new platform for rich Web-based applications, and said the back-end computation in the future would not be done on corporate deployed infrastructure but on large scale services.