Are user customizations transferable from Word 2003 to Word 2010 and possibly to yet-to-be-released Word 2013?

Based on the comments in https://www.msofficeforums.com/word/...html#post42590, I'm seriously thinking about doing a once-in-a-decade upgrade to Word 2013. But it dawned on me that I may lose my precious user customizations.

For example, will the toolbars that I've carefully crafted over many years seamlessly migrate to Word 2013 (2010)? How about the keyboard shortcuts saved in a normal.dot? It will be a PITA if I had to re-assign keys to my liking.