certificate renewal

This morning I started up my system, and some strange thing appeared in my system tray. Something I did not see before. So I opened it: this popped up:

(Click picture for a larger image)

I already got a mail message from Our system administrators that this was about to happen ( the certificate was about to end) but Vista kept track for me also. This is a nice feature, but do I want to bother my users with it? I don’t think so, I’d rather mail them, as our sysadmins do. But still if you know what it’s about, it’s a nice reminder.