This bug was tested LibreOffice v4.1 RC1 running in windows 7 and XP. It appears that LibreOffice loses formatting when importing MS xlsx files. I have attached an example.
Steps to reproduce the bug:
1. Open attached Demo-2012SummerOlympics.xlsx document in calc
2. Open attached Demo-2012SummerOlympics.xlsx document in Excel2010/Office 365
3. Compare the documents.
Note item #6 in the screenshot that the chart is not displayed
Created attachment 81711 [details]
MS .xlsx file imports incorrectly
Created attachment 81718 [details]
Comparison of xlsx in Excel vs Calc 5-6
This is a natural consequence of error 509 in column I for the not still implemented Table function.
Just close this report as Not a bug.