I have Skype for Business on Windows 7. For a long time I've always been able to click these "Join Skype Meeting" links in e-mails and calendar appointments from co-workers.
Starting last week these quit working for me. No changes have been made to my Skype or Outlook/Office. It keeps directing me to some Microsoft/Skype webpage that wants me to download the meetings plugin. I already had that, but I tried re-installing it several times to no avail.
I can still join meetings if someone directly adds me or if I click the button in "Join Lync Meeting" button in Outlook (which is weird because neither I nor anyone else is still using Lync… we upgraded to Skype for Business a year ago). The "Join Online Meeting" button also does not work.
Best Answer
I had a similar problem with a user. What fixed it for us was removing the Skype/Lync add-in (File > Options > Add-Ins > Go) then adding it back in (UCAddin.dll). Once it was added back in and enabled, the Skype/Lync functions worked correctly again. We actually had to remove the add-in and re-add it -- merely disabling and re-enabling it didn't fix the problem.