What Microsoft Exchange Online server are your users on?

Something we have seen first hand is how annoying it can be to discover what Exchange Online server a user is connected to. It is relatively simple enough (log into OWA, go to Options, About, sift through the information there) – it’s still a several-click process per user.
The team over at MessageOps have developed a tool which allows you to perform the same lookup in bulk:
http://www.messageops.com/blog/index.php?/archives/26-Determining-which-Microsoft-Exchange-Online-Mailbox-Servers-your-Users-are-on.html