Guild Wars 2

I have a question regarding Server Populations: Are they measured by how many accounts have chosen the server as their ‘Home’ server – whether presently online or offline – or is it measured by how many people are presently playing? In short, in order to see a server drop from ‘Full’ to ‘Very High’, will I need someone to Transfer Servers, or will I need someone to simply log out of the game?

You need someone to transfer which happens fairly often. Sometimes whole guilds will transfer.

Server population is based on number of accounts attached to each server.