Since the upgrade to outlook.com there is an issue with unwanted notification on calendar events on mobile devices. When adding a new calendar event, with the notifications option off, there is still a default notification sent to PC and Mobile Devices unless you manually delete this option on every appointment. I can't find any way to change the default settings so you don't have to manually delete the notification each time, or to change the default time selection to where it will not automatically create an alert. Turning off the notifications only turns off those sent via email. And I can't turn off calendar reminders totally on my mobile devices, as there are times I want to be reminded of appointments.
This is especially annoying because every old entry in my calendar (from before hotmail became outlook.com) was updated with a notification, when there was none selected before. I would have to manually delete each mobile reminder from every entry in my calendar, which would be extremely time consuming. I constantly have my mobile devices alterting throughout the day, and what is worse is when they notify me of the next day's "all day" appointments at 11:45pm and wake me up.
If anyone has a fix for this, please let me know. Otherwise, I hope Microsoft will read this post and make this important change to the Outlook.com calendar quickly