Comment 19 for bug 200899

> Is it only because there is no 'real' oblique variant available?

I can't tell for sure if that's the only reason, but I can confirm it for those fonts that fail on my system to export in italic (e.g. Arial Black, Impact, Tahoma, Droid Sans) that they do not include an italics/oblique variant as separate font files (i.e. Inkscape renders the font with a "faux" style and fails to consider this special case when exporting to PDF. Possibly the available cairo functions for font/text handling contribute to the problem, but I can't really tell: I'm not a developer myself - just helping with bug triage).

> (…) how I can see whether there is a 'real' oblique variant installed?

I don't use Windows myself (on osx, I use the font manager installed with the system, which lists all available variants of a font, and can show the path to the font file for each). Additionally you can browse the directory where the installed fonts are located, and check the file properties of the installed font files.

> (…) but I could not find a solution there

AFAICT there are no known workarounds besides converting the text to path ('Path > Object to Path') before exporting (note that the status of (this) bug #200899 is still 'Confirmed', not 'Fix Committed' or 'Fix Released').