Poor quality of PNGs exported from Illustrator, in documents that are then PDF'd

Hi All,
This is a strange one, which has taken up a lot of time to try to solve.
I crreated a package of variants on the company logo and exported them from Illustrator as PNGs. I even tried them at 150dpi - then 600dpi.
When I put them into MS Word or Apache Open Office documents they look perfect: sharp, crisp, perfect curves. Hurrah!
However, when I export those text documents as PDFs from MS Word or Open Office, the logos look terrible and ragged.
I have all the settings correct when I export as PDF - lossless compression, print quality etc. If the logos are SVG images [vector], they are perfect PDF'd from Open Office but I can't use those in MS Office. Aggh!
After a lot of experimentation and discussion over at Apache's forums - there was no solution, until...
I pasted the logo artwork from Illustrator into Fireworks - of all things - and saved it as a 300dpi flat PNG from Fireworks. That PNG works perfectly when in a document that's exported as a PDF. I wouldn't be at all surprised if one from Photoshop would be good too.
So - I think that - the common denominator/crux of the matter is the PNG files that are created by Illustrator. They appear great inserted into documents but don't survive a subsequent PDF export well at all.
I'd love to read any comments on this?
[Also, for laughs, I tried high res/high quality TIFFs and JPEGs from Illustrator, and had the same problem]

johnivanwhite wrote:
Hi John M,
Microsoft .WMF format. [.WTF?] is pretty good in the resultant PDF. However, when you zoom in to the PDF, the curves get a bit rounded-polygonal, in a smooth-bumpy way. Odd - not a huge issue unless people zoom in. However, it is evident if they print it. And they will.
Right. What you're seeing there is the Windows Metafile format's lack of support for bezier curves. Close inspection reveals curves that are made up of many small straight line segments.
However...
That's why I asked about platform. Running Windows, it's possible to Copy from Illustrator and Paste Special > Enhanced Metafile in MS Office apps. With that procedure, the result is vectors that land in Office without the full WMF conversion and resulting segmentation.
To demonstrate; I made a small circle in Illustrator with a black stroke and yellow fill.
1. I exported to WMF, then inserted in Word and exported to PDF.
2. I copied from Illustrator and used Paste Special > Enhanced Metafile in Word, then exported to PDF
Compare the results (zoomed to a quadrant in Acrobat):

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