current version of unicode-font

[Peter R. Mueller-Roemer]

I found some serious faults (with the implementation of short sequences 
of combining diacritical marks, Greek and Hebrew with their accents and 
points) with Arial Unicode MS version 1.00 (C) ...- 2000.
I would like to test the newest version of this and other fonts, but am 
reading that MS is not allowing / providing download of this font any 
more. 

1. Which is the currently most up-to-date version, and where can I find it.
2. If the newest version can only be had by buying new Office-products, 
than the label 'OpenFont' is not deserved.

3. Any experience with junicode, it claims compliance with unicode 4.0.  
Does it cover the range 0000 - ffff of Unicode or at least combining 
diacritical marks, Greek and Hebrew) ?

Peter