How to view/subscribe Hotmail Calendar inside Gmail

You can export your Hotmail/Outlook calendar as ICS format and subscribe it at Gmail.

Login to Hotmail and switch to calendar view first.
Cick Share – Your calendar.
Click Get a link – Create (under show events details)
Copy the ICS link and paste into notepad.
Change the link from webcals:// to https://. Copy the modified link
Go to Gmail Calendar
Click Other Calendars – Add by URL
Paste the Modified Link and click Add Calendar button.
You will see new Calendar items in Green.
The default calendar name is ugly. You may edit it by entering into Calendar settings.
Enter a friendly name in Calendar name.
Done.