Hi,
When you install Microsoft Skype on a Windows-based computer that has Microsoft Lync installed, you experience one or more of the following issues:
Microsoft Outlook does not display presence information.
The Microsoft SharePoint client does not display presence information.
Other Microsoft Office applications that support presence features do not display presence information
This behavior may occur if the value of the DefaultIMApp registry entry in the following registry key is incorrect:
HKEY_CURRENT_USER\Software\IM Providers
Note The DefaultIMApp registry entry specifies which IM application provides IM and presence information in Office applications. When you install the Lync 2010 client together with Microsoft Office, the value of the DefaultIMApp registry entry is updated to “Communicator.” Or, if you install the Lync 2013 client together with Microsoft Office, the value of the DefaultIMApp registry entry is updated to “Lync.”
To work around this issue, follow the steps that are appropriate for the version of Windows that you are running.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.
Windows XP, Windows Vista, or Windows 7
Exit the Skype client and all Office applications.
Click Start, click Run, type regedit.exe, and then click OK.
Locate the following registry entry:
HKEY_CURRENT_USER\Software\IM Providers\DefaultIMApp registry value
Right-click DefaultIMApp, and then click Modify.
Type Skype in the Value data box, and then click OK.
Exit Registry Editor, and then restart the Skype client and the Office applications.
Windows 8
On the Start screen, click the Search tile.
Type regedit in the Search window and then double-click regedit.exe.
Locate the following registry entry:
HKEY_CURRENT_USER\Software\IM Providers\DefaultIMApp registry value
Right-click DefaultIMApp, and then click Modify.
Type Skype in the Value data box, and then click OK.
Exit Registry Editor, and then restart the Skype client and the Office applications
Hope this helps
