Nearly 80% of businesses have Macs in-house, nearly double the percentage that said they had users running Mac OS X two years ago, a research firm said today.

"Then, we were talking about onesies and twosies," said Laura DiDio, a research fellow at Yankee Group Research Inc. who conducted a survey of more than 700 senior IT administrators and C-level executives. "Now the number of actual users is very significant. A number of the businesses said that they had 50 or 100 or even several thousand Macs deployed."