alternative to postgresql

Hi,

My boss found postgresql is not as easy as MS-ACCESS in that postgresql is
mainly
deployed on unix/linux side, and deploying on windows platform is
particulously troublesome. that means the company has to spend more dollars
for a linux server for that
database.  i know some alternative as MySQL, but i heard that product
doesn't support
nested query, no updatable view, no outter join, etc. so are there any
better tools around
as easy, quick, yet powerful DB candidate?