Windows 7 - "Cannot open default email folders. Server is not available"

Hey guys,
I have a user who is using Outlook 2010, and intermittently recieves the error "Cannot open default email folders. Server is not available." When she receives this error, outlook closes. Looked in the event viewer when it crashed it made this:
P1: 300111
P2: 14.0.6029.1000
P3: heqz
P4: 0x80040111
She is connecting to a POP3 account online, everything checks out in the "mail" settings in the control panel. Her .pst files aren't too big.
I've tried a repair install, an uninstall followed by a fresh install, and updating to SP1 for Office 2010. Nothing seems to be helping, it is hit and miss when it does it, which makes it that much harder to troubleshoot. Any thoughts?

Some suggestions for the problem in this thread:
Cannot open your default e-mail folder. - Microsoft Answers

Yeah, I've tried recreating the profile from scratch. Even without pointing to the .pst files it still has issues once in awhile. I am starting to think that it may be some sort of time out when it is trying to get to our email server in TX.

I had a similar problem a while ago, everything was as it had been for years, settings wise. Turned out my provider had changed the POP3 server protocol to demand a secure password. I just had to tick that box.