Index: src/log4net/Appender/RollingFileAppender.cs
===================================================================
--- src/log4net/Appender/RollingFileAppender.cs	(revision 1650214)
+++ src/log4net/Appender/RollingFileAppender.cs	(working copy)
@@ -643,15 +643,19 @@
 				}
 				else
 				{
-					if (LogLog.IsErrorEnabled)
+					// Internal check that the file is not being overwritten
+					// If not Appending to an existing file we should have rolled the file out of the
+					// way. Therefore we should not be over-writing an existing file.
+					// The only exception is if we are not allowed to roll the existing file away.
+					if (m_maxSizeRollBackups != 0 && FileExists(fileName))
 					{
-						// Internal check that the file is not being overwritten
-						// If not Appending to an existing file we should have rolled the file out of the
-						// way. Therefore we should not be over-writing an existing file.
-						// The only exception is if we are not allowed to roll the existing file away.
-						if (m_maxSizeRollBackups != 0 && FileExists(fileName))
+						// if the file is not being overwritten we should continue appending
+						// at least we will not truncate the existing logfile which is definitely
+						// not a good idea
+						append = true;
+						if (LogLog.IsWarnEnabled)
 						{
-							LogLog.Error(declaringType, "RollingFileAppender: INTERNAL ERROR. Append is False but OutputFile ["+fileName+"] already exists.");
+							LogLog.Warn(declaringType, "RollingFileAppender: INTERNAL ERROR. Append is False but OutputFile [" + fileName + "] already exists. This time we append anyway by changing Append temporarily to True.");
 						}
 					}
 				}