The book instances of the 1.4-M1 release are not compatible with 1.4-M2, so you cannot copy over the contents of the bookstore directory. You will need to republish your books. Of course, once Daisy 1.4-final is released, we will maintain compatiblity or provide upgrade tools.
If you are using the tanuki wrapper to start/stop the Daisy processes with the scripts provided in our docs, then add the following to the dsy_wiki.wrapper.conf:
```
wrapper.java.additional.4=-Djava.endorsed.dirs=%DAISY_HOME%/daisywiki/endorsedlibs
```
If you made custom book publication types, then check what changed to the default one between 1.4-M1 and 1.4-M2 and adjust accordingly.
Skin compatibility:

there are a few new XSLs for the book pages. If you have a fallback to the default skin these will automatically be available.
Some XSLs changes:

the error.xsl changed a bit to follow changes that happened in Cocoon 2.1.8 (Cocoon stacktraces and additional exception nesting). If your skin contains a custom copy of error.xsl, check out these changes.
document-to-html.xsl, document-to-xslfo.xsl, documentlayout-xslfo.xsl: added support for rendering footnotes
documentlayout.xsl: fix for double display of comments with new Xalan version (seems like a bug in Xalan)
util.xsl

You can easily view what changed by browsing the skin directory in source repository via viewsvn, click on the name of a file and then on the bottom of that page you can retrieve the diff between revision 2219 (Daisy 1.3.1) and revision 2379 (Daisy 1.4-M2). See the tags if you are wondering where these revision number come from.

This should not affect users, but the path resources/cforms has been changed to resources/cocoon/forms

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2.11 1.4-M1 to 1.4-M2 upgrade		2.11.3 Upgrading