Seeking a multi-time reminder software

Multiple time to be able to remind, that is, to set every 30 minutes, 45 minutes and so many reminders, the best can be delayed five minutes to remind the best free software

I do not use OUTLOOK, up too much memory of the .

this function in an office suite called Office Outlook's program there, Outlook is a mail management software, you can re-open after the new appointment in the Calendar tab or plan or in the task selection key card set, to find it after the study on their own.