This may be stating the obvious, but if you have your receive mail set to leave messages on the server so that you can get them on your PC as well, you will hear the true number of messages on the server in your pop mailbox, but the vnqt only downloads those you don't already have. For instance, if you have ten online but you've already downloaded 5 of them, you will only get the 5 you haven't got on your device when you check mail the second time when the new 5 were added to the internet. Now if you have emptied your trash, the system has no way to know you've already seen the messages and so you'll get all ten this time. This is why sometimes you get the same message twice and sometimes not. If it can be accounted for on your active vn then you don't get it downloaded again. If it has been deleted, then the system thinks it's new to you and you get it downloaded again.
Now if you have your settings set to delete messages after downloading, there are two ways this can be handled. One is to check on the next check mail round and delete those already downloaded. The other way is to delete right after they are downloaded on the same pass. I'm not sure how this software does it. If the former and you only check mail once then delete and shut down then restart, you might get repeats. IF that doesn't happen it's working the latter way.
