The announcement “totally blindsided” NRG, according to a source familiar with the negotiations, only the coming weeks before the event was scheduled to occur. IDG World Expo, separation technology publishing giant IDG, had no reason not to expect work will make his customary appearance at Macworld. Then word from Cupertino.

What is not clear when Apple decided to skip work will be substantive. The source reported that Apple has been strained IDG together for several weeks, which means that business-as-usual regarding the vacancies in anticipation of the emergence of up to the moment that it was not.

Apple representative did not return call seeking comment. IDG World Expo Apple declined to comment on the decision for his statement, Paul Kent, vice president and general manager of Macworld Conference and Expo:

While we are certainly disappointed by the decision of Apple did not participate in Macworld 2010, we are on track to deliver the show this year, with strong participation numbers and some 500 exhibitors showcasing their products at the January events. Macworld Conference and Expo thrived for 25 years thanks to strong support from tens of thousands of community members Mac, which are used worldwide Macworld, as a way to find great products, participation in professional development training, and nurture their personal and professional networks. We are determined to continue to serve its own interests at Moscone Center, January 4 - 8, 2010.

Apple decided to terminate its relationship with Macworld is not a complete surprise. Gizmodo speculated that Apple is planning a visit for quite some time. Ultimately, the company participated in any massive technology trade show is the risk-reward calculations. Experience has shown, often more exhausting than rewarding. And if you also have to pay millions for this experience, then it is understandable why Apple would conclude that the Macworld Apple needs more than Macworld Apple needs.

But at this point of the story about the work is still surrounded by a facade speculation.

When Apple to make its decisions in the ditch Macworld? And once he made the decision if it decides to have Phil Schiller needs of the victims to work? Lee, Business Week report because Apple hand? And why Apple would decide on the accounts of Macworld 2009, Jobs’ final appearance at the show, which may have provided lift to what was already expected to be somewhat underwhelming speech?

The official explanation is that Apple did not think it would be worth their time to invest in delivery About Steve Jobs Show, where it will be the last time the company came to Macworld. Apple just did not throw a job seminars together in a couple of weeks of this kind requires extravaganza months of preparation, as a product of the team to create a demo or complete the project, and weeks of work with myself to every last detail goes as planned.

So, if the passage of Macworld was the plan all along, it’s likely that jobs paying attention to other countries in the past few weeks. This leaves the question of why Apple will line IDG along this long period of time, the latter IDG World Expo announced job keynote speech for the past four years was on December 3, and he made a statement that in early October.

Perhaps, Apple did not decide to skip work to the very core recently. This is understandable tough decision: Any not available at a major event, Apple will immediately increase the speed of medical and hearing the engine, but why spend all your time training Jobs and Apple to address that do not seem to hold all exciting?

In any case, there is no love lost between Apple and IDG, the two companies that have traded shots over the many years of development Macworld. This is not surprising that their final dissolution will be sharp.