SOLVED: Download The Latest Mitel Unified Communicator Advanced (UCA) Client MiCollab you are trying to find the most current Mitel MiCollab Client (formerly Unified Communicator Advanced UCA) on the internet, you are looking in the wrong place.  You already have it.  It is stored on your Mitel MAS server.

To download the most current Mitel UCA build your hardware can handle just use this URL:

http://<your micollab server name or IP address>/ucs/dl/UnifiedCommunicatorAdvanced.msi

This took me quite some time to locate but in my case, UCA 6.0.422.0 worked just fine on Windows 10 Pro 64 bit AFTER I made a registry change to avoid the dreaded MiCollab CONNECTION LOST.

Note that the big change from v5 to v6 UCA is that it no longer requires the desktop to request a certificate from the MAS / MGB server.



  1. Avatar
    Bababooey November 15, 2018 at 10:38 am

    Thank you! This ending my 45 minute search for the software.

  2. Avatar
    Nikola February 26, 2018 at 7:38 am

    Works. Thank you.

  3. Avatar
    kpangui April 26, 2017 at 5:31 am

    Micollab cannot be downloaded. thanks

    • Ian Matthews
      Ian Matthews May 18, 2017 at 10:00 am

      Perhaps you are not licensed for it? I have never seen this fail.

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