350+ users with more then one device - good way to delete the old devices?

[jonros]

We've got a little bit more than 350 users that are connected to two or more devices. It should be one device per user. He who has given new device to users has forgotten to delete the old ones. Does anyone know if it's possible to delete the old devices in a rather easy way, or do you need to search each device by device to delete them?

[garybidwell]

Any logical grouping or something they all have in common for the devices you what to delete that your can create a advance search or smart group for?
If so just view the result and send a mass action to them all at once.