I don't often get invited to meetings, but when I do I usually miss them due to the very inconspicuous nature of Outlook's meeting reminders.
Typically, it quietly pops up a window under everything else, doesn't "bounce" and the only way for me to get a reminder is to notice that blue reminder icon on the dock in the midst of 50 or so other icons. Often I'm in a VM so I may not even see the dock.
Is there any way to get a reminder I have some hope of actually seeing?