Skype webchat integration on Outlook.com works in Skydrive tab view only

Ever since the launch of Skype (and Facebook) webchat integration into Outlook.com I am experiencing an issue where using the Skype messaging pane from the various tab views (Mail, People, Calendar, SkyDrive) while logged into outlook.com is only possible from the Skydrive tab.

In addition another issue occurs where connected facebook chat histories are only displayed in Calendar and SkyDrive view but NOT in Mail and People view.

Apparently switching my language settings in the according areas (Mail, People,Calender & Skydrive) from English (US) to English (UK) seems to be a workaround and skype integration then seems to work fine (the issue with the facebook chat history display remains though).

Please refer to the below private message thread for detailed information and previous analysis information (provided fiddler trace & screenshots):

https://answers.microsoft.com/en-us/windowslive/forum/mail-im/skype-chat-works-in-skydrivecom-but-not-in/454896ea-1502-4c3d-8463-def5ee5da3b3?tab=PrivateMessage

Thanks & Regards

Serge