The short answer is 'No'. There is no need to download compatibility pack for 2007 office system if you are running MS office 2007. Compatibility pack is required; if you want to run higher version MS office program on lower version MS Office program.
For Example:
Want to run MS Office 2007 program on MS Office 2003: Compatibility Pack is Required.
Want to run MS Office 2003 Program on MS Office 2007: NO compatibility pack required.
You need to open the files with the appropriate Office 2007 program and save in compatibility mode. You usually cannot open Office 2007 files with Office 2003.
Yes, but a special "Compatibility Pack" is needed. The Compatibility Pack works with Office 2000, XP and 2003.
You do not. It must be saved in compatibility mode for you to open it with office 2003.
Office 2007 uses a newer file format than Office 2003. For example, instead of .doc, a file from Word 2007 will be in the .docx format, something Office 2003 doesn't understand. For compatibility, Office 2007 can be made to save files in the .doc format. Office 2003 can also gain compatibility with Office 2007 file formats by downloading and installing an add-in at http://office.microsoft.com/search/redir.aspx?AssetID=DC101298101033&CTT=5&Origin=HA100444731033 More on this at http://new-digital-world.blogspot.com/2008/03/office-2007-files-to-office-2003.html
You can open a 2007 Excel spreadsheet with Excel 2003 if you save the file in Excel 2007 using "Save As" and select the 2003 compatibility mode.
Obtain the Office Compatibility Pack for Office. Here: http://www.microsoft.com/downloads/details.aspx?familyid=941b3470-3ae9-4aee-8f43-c6bb74cd1466&displaylang=en
Earlier it was not possible but now Microsoft has released a update to open 2007 files using office 2003. More on this at http://new-digital-world.blogspot.com/2008/03/office-2007-files-to-office-2003.html
Microsoft offers a download for opening Office 2007 file formats in earlier versions of the Office Suite. Known as the Microsoft Office Compatibility Pack, this addon is available freely on the Microsoft Download Center.
It is compatible. It only depends what type of file you save it as. If you are still having incompatibility problems, download the Compatibility Pack for Microsoft Office 2007 form Microsoft Downloads.
You need the Office 2007 compatibility pack. It's a free download from Microsoft.
Purchase an upgrade version of Office 2007 and install. It will replace the Office 2003 program files with the appropriate Office 2007 files. Your data files will remain unaffected. You can use all of your Office 2003 data files with Office 2007 (but Office 2007 files may not be backward compatible for Office 2003).
Compatibility mode is the term used in Microsoft Office that allows you to edit documents from Microsoft Office 2002 in Microsoft Office 2007 with only the features of Microsoft Office 2002.