A copy of the message from 20 years ago is now in the 9/11 Memorial Museum in New York City.

"Just wanted to let you know I'm OK," Jim Cleere told his wife Jean in the voicemail message.

Cleere, of Newton, left it on Sept. 11, 2001. He was calling from his room on the 15th floor of the Marriott World Trade Center — part of the complex after a plane hit the center's North Tower.

An executive at Seabury & Smith, an Urbandale-based insurance division of New York's Marsh & McLennan, he was in New York for his first annual meeting at the head office as an assistant vice president.

The company's offices were on floors 93 to 100 of the 110-story North Tower, exactly where the hijacked plane piloted by al-Qaida terrorist Mohammed Atta struck at 8:45 a.m.

"It's lucky I wasn't over there becaus

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