iCloud: Notes overview
You can write and edit notes by using the Notes app on iCloud.com from a Mac or Windows web browser. Changes you make are automatically pushed to your iOS devices and Mac computers where you set up iCloud for Notes. On your iPhone, iPad, or iPod touch, changes are pushed to the Notes app. On your Mac, changes are pushed to Notes (or Mail in OS X v10.7.5). No matter which device you use to create and edit your notes, the changes are updated everywhere.
On your Windows computer, your changes are pushed to Microsoft Outlook in the Notes folder of your iCloud email account. You can see your iCloud notes by expanding your iCloud email account in the Outlook folder pane (also called the navigation pane), then selecting the Notes folder in the email account. You should add and edit your iCloud notes only from iOS devices, Mac computers, or iCloud Notes. If you add or edit iCloud notes using Outlook, those changes don’t appear on your iOS devices, your Mac computers, or in iCloud Notes.
iCloud Notes uses your @icloud.com email account to store your notes. If you don’t have an @icloud.com email address, you can create one by turning on Notes in iCloud preferences on your Mac or in iCloud settings on your iOS device.
Access iCloud Notes from a web browser
If you're using another iCloud app, click the app's name at the top of the iCloud.com window, then click Notes.
When accessing iCloud Notes, make sure you use a browser recommended in the Apple Support article iCloud: System requirements.