The differences between them are not extensive so you can work in Excel 2010 easily if you are familiar with Excel 2007. You can save your files so that Excel 2007 will recognise them.
Yes, VLOOKUP is still in Excel 2007 and 2010.
It depends. There is no direct relationship between Windows and Excel versions. If you have Windows XP, you probably use Excel 2003. If you have Windows 7, you probably use Excel 2007 or Excel 2010. Excel 2007 and later can read Excel 2003 files, but Excel 2003 cannot read Excel 2007 files, unless you save the files in "compatibility mode." Excel 2007 and later contain some features not available with Excel 2003 and earlier. If you need to use the same worksheets with several versions, then save your files in compatibility mode with the newer versions.
Excel 2007 does use the .xlsx extension for its workbooks.
Name the tool that a user of Ms Excel 2010 can use to enlarge and reduce the size of the spreadsheet view.
MS Excel 2003 and earlier use the XLS format. MS Excel 2007 and later use the XLSX format.
That depends on the version. Up to version 2003, it was row 65,536. From Excel 2007 onwards, it is row 1,048,576.
.xls for 97-2003 and .xlsx for 2007 and 2010.
If you have 2010, then you can open it and save it as a 2010 workbook. It won't open with Excel 2003 after that though so you cannot have the benefit of the extra rows in Excel 2003. That is one of the reasons for using 2007 or 2010.
you may calculate
You can use most versions of MS Word and MS Excel with Windows Vista. The versions mostly associated with Vista are MS Word 2007 and MS Excel 2007.
There is a lot to learn about Excel 2010. If you have never used any version of Excel, then a good course about it or even a good book will help. If you have used older versions of Excel, then you would not have much problem learning to use Excel 2010.
In Excel 2010 the number of rows per worksheet is 1,048,576 and the number of columns is 16,384 which is column XFD. That makes 17,179,869,184 cells.