Above is a sample screen showing 5,000 accounts in a single domain. If you get into more than 5,000 accounts in a single domain, be sure to give the program plenty of RAM, as a dialog box with that many values uses up a lot of RAM.
If you're over 10,000 accounts in a single domain, we recommend you don't use the GUI. Instead, manage your config externally (using a text editor or generate the file with a database app, etc.) and add the NoGUI command to your config file.