If you don't like the Skype integration with Outlook.com and SkyDrive here's how to disable it:

Step-by-step instructions:
1.Open Notepad as an administrator
2.Open the file \Windows\System32\Drivers\Etc\Hosts
3.At the end of the file, add skypewebexperience.live.com and save.
4.Close Notepad and restart SkyDrive/Outlook.com browser instances.

See Disable Skype integration in Outlook.com and SkyDrive for details.