This page lists some errors which may occur during installation and the solution.

In general, do NOT 'ignore' any errors unless we tell you to.

If you have to retry an installation, when it is an upgrade from versions 1 - 4 going to version 5 or later, then make sure you have told the installer to install the database. Sometimes a partial installation will make the installer think that the database is already installed.

This is when the installer cannot initialise the PostgreSQL database.

At this point, the installer is running the 'initdb.cmd' file (located in the VPOP3 directory) as the 'vpop3postgres' user.

Problems here may be because the installer cannot use the 'Run As' facility in Windows to run the program as a different user. It has to run it as a different user so that file & directory permissions are set correctly.

One reason why this may not work is if the Secondary Logon service in Windows is disabled, so you could start that service manually, and then have the installer retry the operation