Once the total number of messages waiting to be published exceeds the maximum queue length the log publisher will switch to a synchronous mode to catch up. This will cause the client to block until each new message is published.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2