I have encountered the following bug. Since I can not file new bugs, I post it here:
The fonts newly shipped with Microsoft Office 2007 do not handle aliased rendering on low resolution.
To reproduce: Type the text from the attached screenshots and select "Calibri" (or "Candara" or "Corbel" or ...) font. Zoom out until the fonts are not anti-aliased to see that non-latin characters are rendered as bold.
When zooming in, the font becomes anti-aliased and everything looks fine.
This does not occur with older Microsoft fonts (Arial, Times, ...).
Beta report with screenshots of the problem
Does anyone know a solution?