hi i have osc server in my network and work by this 60 user without any problem but 1- 3 client after install software Microsoft Office Communicator 2007 R2 show this message"Office Communicator 2007 cannot start. The product license may be expired because you are using a pre-release or evaluation copy of the program, or the product key information may have been modified in your windows registry. Please run Setup to uninstall and then reinstall communicator." but this pc not update and havent KB974571 patch in os 2- one pc have this patch and i am remove it but now totally not work whiteout any message 3-one user can not send any file by (2000 or more MB) size to any user I'm check this problem on other pc but not solve 4- one user have kasperskey internet security 2009 v8.0.0.357 and trusted ocs in firewall but user can not send or receive to any user file ,and me sure this problem pendent to kasperskey internet security but i cant solve this please help me thanks

After checking the issue, it seems this is a general OCS related issue. As this forum focuses on Windows SteadyState specific issues, this inquiry would best be posted to OCS forum: http://social.microsoft.com/Forums/en/category/officecommunicationsserver The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.Sean Zhu - MSFT