-If you have trouble using LyX or have a question, consult the
-documentation that comes with LyX and http://wiki.lyx.org.
-If you can't find the answer there, e-mail the LyX users' list
-(lyx-users at lists.lyx.org).
+If a file from an earlier version of LyX is opened *and saved* with
+any version of 2.3.x, then the original file will automatically be
+backed up. The backup file will be found in the backup directory, if one
+is set under Tools> Preferences> Paths, or else in the same folder as
+the original file, if no backup directory is set. The filename of the
+backup file will be:
+ ORIGNAME-lyxformat-NUM.lyx~
+where NUM is the LyX format number of the original file. In the case of
+a 2.2.x file, this will be 508, but in the case of older files it will be
+different.
+
+The file lib/RELEASE-NOTES lists some known issues and problems compared
+to the current stable releases (LyX 2.2.x). We strongly recommend that
+packagers of LyX on various platforms and distributions read this file.
+
+As with any major release, this one comes with a lot of new features but
+also some bugs. If you think you have found a bug in LyX 2.3.0, either
+email the LyX developers' mailing list (lyx-devel at lists.lyx.org),
+or open a bug report at https://www.lyx.org/trac/wiki/BugTrackerHome .
+Please specify if the behavior you are reporting is different from behavior
+in a previous LyX version.