Office 2007 install corrupted excel spreadsheets?

[fox_mulder33]

Hi Everyone,

Has anyone come across an issue where opening a 2003 Excel spreadsheet in
Excel 2007 resulted in it deleting certain workbooks from the spreadsheet?
This spreadsheet, even if opened again in 2003 does not show these deleted
workbooks. This has become very frustrating for a client of mine.

Any help will be appreciated.

Thanks.