SEATTLE -- Microsoft billionaire Charles Simonyi says his $25 million trip to the international space station was worth it.

He says he views the money as support of the space program and he has no regrets at all.

Simonyi spoke to The Associated Press Monday from Star City, Russia, where he was still recovering from his 13-day space trip.

He says it took about a day after the Russian rocket landed Saturday to recover his balance. He still feels a little weak and has slightly lower than normal blood pressure.

Simonyi says he'll stop in Moscow and his native Hungary before returning to his Seattle area home in three or four weeks.

Simonyi says his friend Martha Stewart is happy everything went well. He says he doubts she'll follow him into space, although he says she's very adventurous.

The 58-year-old Simonyi is a former Microsoft executive who led development of the Word and Excel software programs.