Chances are, you may want to change the product key of your Mac Office 2008 upon finishing an update from their site because the product key used to install your Office 2008 installation used an invalid product key.

If after the update it does detect that an invalid product key was used, the office assistant will keep on popping up while the application that you chose to open will never be seen. To reset the product key, delete the following files and send to trash.

  • /Users/[username]/Library/Preferences/Microsoft/Office 2008/Microsoft Office 2008 settings.plist
  • /Applications/Microsoft Office 2008/Office/OfficePID.plist

[username] would be the username of your laptop. Run any Mac Office 2008 application and the office assistant will now have a textfield of the product key for you to input.

Mac OSX Lion users: here is a tip from commenter Tyson.

excelThe XLSX format is a Microsoft Excel 2007 format that is not compatible with older versions of the said application. Luckily, there are alternatives to converting a 2007 Excel document to an older version of it. I prefer the online way but there is also a compatibility pack for MS Office that does the trick. The format is currently not supported by GMail attachment viewer or any of the online office suites like Google Docs so you have no choice but to have it converted to an old format else you will not be able to view it.

However, you can easily convert .xlsx spreadsheet to the traditional .xls format using the Microsoft Office compatibility Pack available here. This will help you open, edit, and save .xlsx files in Office 2000, Office XP, or Office 2003. More details on Office 2007 FAQ.

Alternatively, you can convert .xlsx to .xls or other text formats online using the service here. Unlike the Microsoft compatibility pack, the Zamzar .xlsx to .xls conversion services will not require a copy of Microsoft Office on your computer.

And if you have OpenOffice, Zamzar can also convert the XLSX file to OpenDocument spreadsheet format.

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