AIX-EN-PROVENCE, France — Jacques Souquet had gone through several start-ups in Seattle, but he still was not entirely prepared for beginning a high-tech company in his native France.

Failure is still a no-no here, creating a challenge for any start-up. Not to mention the idea that difficulty here seems a contradiction in terms for, after all, the word “entrepreneur” is French.

And Mr. Souquet, 58, a compact man with a gentle manner, has a lot of rules to learn. When he once had to meet a deadline, he asked his colleagues to come in on a Sunday, which they did; but Mr. Souquet got a scolding from his lawyer, who lectured about the legal limits on the French workweek.

Now, Mr. Souquet’s company is up and running smoothly, and that is a testimony to recent changes in France and greater Europe: start-ups are no longer rare. Moreover, Europe’s new entrepreneurs are turning West to learn the start-up culture bred in Silicon Valley before coming back here to apply their learning.