She was/is able to SEND messages from the client, but not receive.
First thing was to check Slingshot's settings for Outlook 2010 (HERE). No problems there (POP3 was pop3.slingshot.co.nz). Ports 110/25 (inc/out).
Decided to download to my poor Granny's computer Thunderbird, and set it (Thunderbird pulls automatically settings for Slingshot...). We also tried setting it manually (Thunderbird-Slingshot Settings Here). Again, strangely enough, we were able to SEND but not to RECEIVE (???).
Firewall is MS for Windows7. Was not able to see anything there concerning Outlook or Thunderbird.
ANY IDEAS. ueberGeeks??...