Sky Drive introduced with 25 GB cloud storage later on it went to 7 GB but after the launch of Google Drive (that offers 5GB) Sky drive ( is a cloud storage service from Microsoft) announced 25 GB of cloud storage for existing users and for new user it will remain 7GB storage.
- Go to Sky Drive and login with you credential
- Promotion link will be appear like the above image => click on it to upgrade it for free and in case if you don't see the link then may be offer expired or you are not eligible.
- Click the free upgrade button to complete the claim.
- This offer is limited period and only for existing customer.