Hi,
There seem to be a bug in the OGIC_POP.llb\OGIC_POP_ListMessages.vi.
Or at least it needs customization to process the response from each mail server. If you open the diagram for this VI, you'll see that it is using the "+OK\s" regular expression to reach the end of the string before the msg-number, msg-size list. In your case, this string is "+OK 5 messages (6190 octets)"
You need to modify the diagram to skip this whole string. One easy way would be to use just "+OK" with the first Match Pattern fuinction and then use an "\r\n" and pass this to the true-case.
I am attaching a screenshot of this. And I have tested this to work fine -- I get the messages in the array.
Hope this helps,
Khalid