======How to install PostgreSQL to use another port======
If the VPOP3 computer has a version of PostgreSQL older than version 8.3 installed for other software, and you can't/don't want to remove that you need to set up the PostgreSQL 8.3 or later for VPOP3 to use a different TCP/IP port number.

The VPOP3 installer can't do this for you, so you have to do it manually

=====Install PostgreSQL manually=====
[[Install PostgreSQL manually]] onto the alternative port

=====Tell VPOP3 to use the new port=====
After installing PostgreSQL onto the alternative port, tell 
  - Run Regedit, find HKEY_LOCAL_MACHINE\Software\PaulSmith\VPOP3\Database
  - Add/edit the PostGreSQLPort DWORD value to the new port number

=====Create the VPOP3 user/database manually=====
Now you need to create the database user/database in the NEW version of PostgreSQL. The installer can't do this for you if it is on a different port.

Open up a command prompt in Windows and find the 'bin' subdirectory of the PostgreSQL installation directory (eg either VPOP3\pgsql\bin or c:\program files\postgresql\8.3\bin or wherever)
Type:
**psql -U postgres -p <new port number>**
For the password use 'pgsqlpass' (or use a different -U <username> and password value if you created a different superuser when setting up Postgres manually)

Then in the postgresql prompt type:
**CREATE USER vpop3 LOGIN PASSWORD 'vpop3pass';**
**CREATE DATABASE vpop3 OWNER=vpop3;**

=====Install VPOP3=====
Finally, install VPOP3, and tell the installer not to install PostgreSQL.