I made a very simple program in VB6 that takes a text file (filled with email addresses for instance) and compares each line with the rest of the file to check for other lines with the same value.
In other words, if you have a large list of email addresses collected from several guilds, or if you (as in my case), have 6 people collecting email addresses separately from different guilds and realms and then combine our lists and then want to remove, or spot, email addresses that appears several times in the combined list, this program is ideal.
Once the program has found two equal entries it will show you the address in a list aswell as remove the overflow entry from the output file which is generated automatically upon comparison.
There's an example file attached to the archive file that you can play around with aswell, as shown below.
Download Here