If the PostgreSQL server won't start at all, because its transaction logs are damaged, you will need to recreate the database store totally.

To do this:

1. Open a command prompt and find the VPOP\pgsql folder
2. Rename the data folder to data_old
3. Run

   bin\initdb -D <VPOP3folder>\pgsql\data -U postgres -W -A md5

4. When it prompts for a password, type in the password you want for the PostgreSQL superuser - we use pgsqlpass. If you choose to use something different, make sure you remember what it is!
5. Type

   copy data_old\postgresql.conf data

   to copy the database server configuration to the new location. You may be prompted if you want to overwrite the existing file. If so, confirm the overwrite.

6. Set the permissions on the new Data folder. In Windows Explorer, right-click the VPOP3\pgsql\DATA folder and choose 'Properties' → 'Security'. Check that the 'postgres' user has 'Full control' of the folder.
7. Start the PostgreSQL service in Windows
8. From the command prompt in vpop3\pgsql\bin run

   createuser -S -D -R -U postgres -P vpop3

   At the 'Enter Password for new role' and 'Enter it again' prompts type vpop3pass. At the 'Password:' prompt type pgsqlpass (or whatever password you defined in the step 4 above)

9. Restore the latest good database backup

Once you're happy everything is working OK, you can delete the data_old folder.