Microsoft Lync Keeps Requesting a Keychain Password for OC_KeyContainer

We have received several reports that Microsoft Lync (version 14.x) was constantly requesting a Keychain Password and displaying the following dialogue box:

The blocked out area shows the user's e-mail address.

On working systems there was an "OC_KeyContainer" in Keychain:

As well as a saved password in Keychain:

On system that had a problem these items were missing.

The solution we found was to go into ~/Library/Keychains and delete the "OC_KeyContainer_[user's e-mail address]. 

Remember that on 10.7 and above the user's library folder is hidden and you must show it by opening Terminal and typing "chflags nohidden /Users/[user's home folder name]/Library

After deleting the OC_KeyContainer file, launch Lync and log in and you should no longer receive the Keychain pop-up.

If you open Keychain Access.app you will notice that a new OC_KeyContainer Keychain and password have been created.

Note: if the OC_KeyContainer Keychain and password already exist in Keychain Access.app, delete them before removing the file from the user's Library folder.