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Paste Special option is missing or not working in Microsoft Office
If your Paste Special option is missing, look here. Paste Special allows you to paste using the formatting of your choice.
You cannot open .xls files by using Microsoft Office Excel 2010
Describes a resolution to a problem in which you cannot open .xls files with Excel 2010.
This file is corrupt and cannot be opened, using Office 2010 email
Describes a problem in which you cannot open an Excel, Word or PowerPoint email attachment. You receive a “This file is corrupt and cannot be opened”, “Word Experienced an error trying to open the file" or "PowerPoint found a problem with content in...
Create flexible, effective conditional formats in Excel 2007 - Excel - Office.com
Learn how to create flexible, effective conditional formats in Excel 2007.
Create, select, edit, or delete a hyperlink - Excel - Office.com
Insert a hyperlink in a worksheet cell or specific chart element to link to a related file or Web page in Excel 2010. You can also modify or remove hyperlinks.