When I tried Skype for my HTC Radar (Windows Phone 7,5) and when I signed in it was kinda slow (understandable because it was the first time) but when I tried to write something in a group conversation I started on the PC, it loaded EVERYTHING for the last month. It took about 3 minutes before skype stopped...
I just thought that was unnecesary, it could have just loaded the last days or max week :S
But after starting it again it has worked fine so far ;D
I recommend to download the latest Skype and search first.
To get the most out of Skype I recommend Skype Premium.
Found this post useful? Please give Kudos↘. Answered your question? Mark it as a solution to help others, Thanks.