When Word 2007 calculates line length it tries to break the line and wrap it to next line on a space or hyphen.

However, sometimes you might not want it to wrap at a hyphen-for example, with telephone numbers. Using a non-breaking hyphen is the key-here's how: To create a non-breaking hyphen, press [Ctrl] + [Shift] + [ -] instead of just the hyphen.

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