+The format of the preferences file has changed slightly. LyX 1.4.x is
+able to read old preferences files, but it will save them in the new
+format, so it is not possible to run LyX 1.3.x and 1.4.x with the same
+personal configuration directory.
+
+The format of the layout files has also changed, but LyX 1.4.x uses a
+converter layout2layout.py written in python that will convert old layout
+files on the fly. You can also call it manually on your layout files if
+you want to convert them to 1.4.x format permanently.
+
+The format of the external template file has changed substantially.
+Automatic conversion is not available, so you need to convert your
+external templates manually. The new format of the external template
+configuration file is described in chapter 6.5 of the Customization Guide.
+
+And of course, if you upgrade from LyX 1.2.x, remember that since
+1.3.0, you have to do the following changes:
+