Office 2003 to 2010 File Migration Strategies - How to avoid Duplicate files XLS and XLSX, DOC and DOCX, etc.

It seems a difficult task to migrate from 2003 to 2010 without having to manage a lot of duplicate files (i.e. XLS and XLSX formats).  I'm looking for suggestions, strategies and tips to avoid these redundancies.
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I'd be careful with converting xls files to xlsx.

1. Macro's:

xls files with macros must of course be saved to xlsm.

2. Links:

About 10 to 20 percent of all Excel files tend to have links to other Excel files. If you convert the xls files to xlsx and then remove the xls files, all links will be broken. OTOH if you leave the original xls files in place, the links will soon be pointing to outdated files if people only work in the xlsx/xlsm files. And people will start working on old copies (the xls files) by accident.

If you want to bite the bullit and bulk-convert xls files, you need a tool that can do that AND a tool that can restore all links afterwards.

Some more links:
You can convert all the documents in bulk to .xlsx.

Here is a good tutorial for it, it explains it to convert it to office 2007, but office 2010 is the same.
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