Skype meeting add-in not getting enabled in Outlook after a restart

Solution to issue:

1. Exit Outlook if it is running.
2. Press the Windows function key, search for "regedit," and then click OK.
3. In Registry Editor, locate the following subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\UcAddin.LyncAddin.1
4. In the details pane, double-click LoadBehavior. If the value in the Value data box is not 3, change it to 3 and then click OK.
5. Exit Registry Editor.
6. Start Outlook.

How to delete a Skype contact from Skype for Business Contacts folder

If you are unable to delete a Skype contact from Skype Client
Then you can delete the contact by following below procedure

-          Exit from Skype Client & Outlook

-          Login to OWA

-          From Contacts folder, you can select and remove the particular contact whom the user want to delete

Lync Client showing old picture

Issue: Lync Client showing old picture

Description: In Outlook it is showing the new picture but in the Lync Client still showing the old picture and not updating to new picture.

Things to Check:
In Outlook, check Test Email Auto configuration

Perform below steps to fix the issue:

Exit from Outlook & Delete offline address books folder

Sign out from SfB & Delete Sign in Info

Go to C:\Users\<UserID>\AppData\Local\Microsoft\Office\15.0\Lync and delete all the folders

Open Regedit -> Computer\HKCU\Software\Microsoft\Office\15.0\Lync\<User Sip profile> Delete User Sip profile from registry

Open Outlook & later SfB

After performing above steps, issue is resolved.