messagingreminder.com is a cool service that integrates with your Outlook calendar and skips your phone's calendar entirely by sending you SMS reminders about upcoming meetings, etc. The services isn't free—it costs about $15 a year—and certainly isn't the only way to get the job done (Yahoo! Calendar does the same for free, for example), but unlike Outlook plugins that do the same, it works even when your computer isn't turned on.