The most common reasons for not receiving reminders or receiving them at the wrong time are listed below:

• Time settings: Make sure that the Time Zone and Daylight Savings Time options are set correctly in your Calendar Preferences.
• Alternate Email Address: Ensure that the email address is verified in your Account Information.
• Insufficient notice (less than 15 minutes): Reminders must be set at least 15 minutes before the time the reminder would be sent. For example, let's say you schedule a meeting for today at 3:00 p.m., and it is currently 2:20 p.m. in your time zone. If you set a reminder for 30 minutes, the reminder for 2:30 p.m. will not be sent because it is less than 15 minutes from when you set the reminder.
• Email delivery schedule: Many email systems are set to poll or check for mail on a fixed schedule. If you only receive new email every 30 minutes, reminders set for less than 30 minutes before an event may arrive late.
• Mobile Device Reminders: When sending text reminders to your mobile device, please make sure that you have registered your device with Yahoo! Mobile.
• Yahoo! Messenger: When sending reminders to your Yahoo! Messenger, you must be connected to Yahoo! Messenger at the time you are to receive the reminder, and you must be logged in to Yahoo! Messenger with the same ID that you used to access your calendar and set up the reminders.