Skype Down
express.co.uk
express.co.uk
I introduced Slack to the team today...
You should really be looking at an on-premises solution if availability is really that much of a concern, in my own humble opinion.
http://www.digitaltrends.com/?p=836715
http://www.pcworld.com/article/2984806/web-apps/microsofts-e...
http://www.engadget.com/2015/09/19/skype-for-web-will-soon-w...
https://blogs.office.com/2015/09/18/enabling-seamless-commun...
Also, Skype just recovered for us, we're having a call in 4 as I'm writing this. EDIT: Skype is still misbehaving.
Although, judging upon the number of comments, no-one seems to care that much.
Skype peers were unreliable, so they identified good peers, which they tagged as SuperNodes, or SNs. Large amounts of these SuperNodes could go down in an instant due to network outages out of their control, buggy software, bad computers, and more. The Skype blog is full of "whoops, too many supernodes went down!" from 2008-2011.
http://web.archive.org/web/20110829025128/http://blogs.skype...
They then added dedicated "mega-supernodes" which they just shoved in an EC2 cloud, and after non-mega SN population declined as mobile took off, they just turned off the P2P-based SN feature.