Font files are some of the most annoying and unwieldy files you will ever have to deal with on a computer, and moving them between computers and operating systems can be an exercise in frustration. Here's some information about the process of moving fonts between Mac OS X and Windows computers.
Copying from the Mac
Connect your USB thumb drive or other removable storage option to your Mac.
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Open "Font Book" in your computer's applications folder.
Select a font you want to move and click on the "File" menu.
Choose "Reveal in Finder."
Copy all the fonts in this folder you'd like to move to the USB thumb drive or other storage device.
Eject the USB thumb drive or other storage and move to your Windows computer.
Adding Fonts to Windows 7
Connect the USB thumb drive or other storage to the Windows computer.
Navigate to the font files using the "My Computer" link in the Start Menu.
Right-click on each font file and choose "Install."
Adding Fonts to Windows Vista or XP
Click the "Start" button in the lower left corner. On Windows Vista, it has a Windows logo, but no "Start" text.
Type, or copy and paste, "C:\Windows\Fonts\" into the "Run" box's text field, then press "OK."
Click "Start," click on "My Computer," then open your USB thumb drive or other storage solution.
Drag the fonts from the USB thumb drive window into the Fonts directory.
Things You'll Need
Mac OS X computer
USB thumb drive or other removable storage
Mac OS X fonts without a file extension cannot be copied to a Windows computer.