Before you upgrade a postgresql package to a new new major or
minor version (7.4 => 8.0 => 8.1), be sure to dump all your data before!
With the new package you will not be able to access your old databases.
Minor subreleases (e.g. 8.0.3 to 8.0.4) can safely access the same database.
Be sure to read the README.cygwin and the postgresql documentation.
I recommend to install the new 8.1 right away, available as [test] version
from setup, and skip 8.0 altogether. 8.1. has major feature improvements
over 8.0, esp. when you use tsearch2 and PostGIS (crash-recovery on GiST
indices, improved concurrency).
I'll keep 8.0 a while as curr, but will drop 7.4 from prev soon.
To update your installation, click on the "Install Cygwin now" link on
the http://cygwin.com/ web page. This downloads setup.exe to your
system. Then, run setup and answer all of the questions.
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