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Close Outlook 2013 if open, then navigate to C:\Program Files (x86)\Microsoft Office\Office15 and find OUTLOOK.
Right-click OUTLOOK and select “Run as administrator” from the drop down menu.
When Outlook 2013 opens click the FILE tab in the top-left corner.
Click Options.
Click Add-Ins. Near the bottom of the Add-Ins menu select “COM Add-ins” and click “Go...”
Confirm that the “Skype Meeting Add-in” is showing up in Active or Inactive Application Add -ins. If they are not, follow the directions at the bottom of the page to get it into those lists.
Select “Skype Meeting Add-in” and click “Remove”.
Click “Add...”.
Navigate to C:\Program Files (x86)\Microsoft Office\Office15 and double-click UCAddin.dll.
You will see that “Lync Meeting Scheduling Addin” appears in your list of Add-ins, and the load behavior should say Load at Start.
Even though this says Lync meeting add-in, it is actually Skype for Business 2015 meeting add-in.
When you go to the calendar section of Outlook you will see that the Skype Meeting option is back.
Exit and reopen Outlook normally to confirm the add-in is still working.
Moving a disabled add-in to active or inactive list
Open Outlook 2013 and click the FILE tab in the top-left corner.
Click Options.
Click Add-Ins.
Near the bottom of the Add-Ins menu select “Disabled Items” and click “Go...”.
Select the add-in you wish to move from the list and click Enable.
The Skype Meeting Add-in will be called either “Skype Meeting Add-in” or “UCAddin.dll”.
The Add-in will appear in the Inactive Add-ins menu once you have enabled it.
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