IM Manager V8.4.5 (build 1297) 解决了下述的问题：
- 外部 Pidgin 2.4 用户传送受病毒感染的档案并不会被 IM Manager 阻挡。
请参考KB: Inbound File Transfers with Infected Files from External Pidgin Users are Not Blocked. - 当政策不允许与外部传档时，外部传档仍可被进行。
请参考KB: File Transfer Is Not Blocked When External Communications Is Disabled. - IMLogRelayService 服务有时会占用较高的内存。
请参考KB: IMLogRelayService Service Experiences High Memory Utilization, Error: "Unable to send ( on Socket ID - 71 ) because number of pending send requests(1001) has exceeded maximum(1000)" - LCS LC Logging 服务错误。
请参考KB: Windows Application Event Log Shows Error Message "Object reference not set to an instance of an object. at RTCLoggingService.RTCLoggingService.OnMessage(Object senderObj, RequestReceivedEventArgs e)" - LCS/OCS Message Injector architecture does not work when server has non-routable IP Addresses.
请参考KB: Live/Office Communications Server (LCS/OCS) Clients are Unable to Receive IM Notifications with IM Manager 8.4 or Higher. Error: "Unable to connect to IMLog Message Injector service at 10.85.12.25:9842" - 在升级至 V8.4.1 後，在 System Dashboard 不能正常显示目前正在进行的交谈数。
请参考KB: System Dashboard Always Displays Zero For The Number of Active Conversations - 支持 EV Retention Category。
请参考KB: Using Integrated Enterprise Vault (EV) Export Fails With Error Message "Error 0x80040308 processing input file C:\IMManagerExports\EnterpriseVault\IML1.xml" in the Windows Application Event Log - 当启动 RTTPS 时，用户可能会发生 IM 信息遗失。
请参考KB: Users not Receiving Messages for Public IM Services when RTTPS is Enabled.
