Outlook Web Access has a pop-up email notification window that is only visible if Web Access is on the screen. If any other program is on the screen, the pop-up window isn't visible. This isn't a pop-up blocker issue because the window isn't visible on any program. The sound alert works but the window doesn't.
Thanks for the help.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic