Fix for error: Lync has both per-user and per-machine instances installed
You may see the error, " Lync has both per-user and per-machine instances installed. Click OK to remove the per-user installation. " The error occurs every time the Lync client is launched. This is caused when a user has downloaded and installed
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Read the complete post at http://www.expta.com/2011/05/fix-for-error-lync-has-both-per-user.html