I’ve been using Windows 8.1 preview as my day-to-day environment for a good 3-4 weeks now and in general everything is working extremely well. One of the problems that did crop up however that has been impacting me is participating in Lync meetings with customers and partners from other organisations.
The problem I experience is when clicking a meeting Lync, instead of launching the desktop Lync client I get routed to the Lync web-client login page. The web client is okay but I prefer the desktop client and it has a few extra features which I find quite useful.
It appears that the code behind the meeting link is doing some browser detection, not recognising IE11 as a compatible browser for the desktop client launch mechanism and then falling back to the web experience.
To work around the issue I pressed F12 to bring up the new IE developer tools. On the emulation tab (look on the left hand side down the bottom of the panel), change the user agent string to Internet Explorer 10. As soon as you’ve done this the page should refresh and the Lync desktop client will get launched.
I’m pretty sure that this will get fixed soon either as a compat update to IE, or as a patch to Lync. Hope this helps you in the meantime!