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        8 months ago
        • Exchange 2000 Conferencing
        • Windows Messenger 5.0 (Live Communications Server 2003)
        • Windows Messenger 5.1 and Microsoft Office Communicator 2005 (Live Communications Server 2005)
        • Office Communicator 2007
        • Office Communicator 2007 R2
        • Lync 2010
        • Lync 2013
        • Skype for Businesses 2015
        • Skype for Businesses 2016
        • Skype for Businesses 2019
        • Skype for Business for Microsoft 365

        Thanks Wikipedia, no way I could have remembered them all. Although I feel like Lync 2010 might be Lync for Business 2010?