I'm using Microsoft Office 2007. How can I search inside multiple Excel files?
Use IceTeaReplacer. It's freeware.
Search & Replace in .docx, .xlsx and .xls files
IceTeaReplacer is a simple, yet a powerful tool to search inside multiple Microsoft's Office Word 2007 (docx), Excel 2007 (xlsx) and Excel 2003 (xls) files within a directory (and it's subdirectories) and replace provided phrase. Supports UTF-8.
There is also a more powerful alternative with various features but it's a commercial one: ExcelPipe.
After searching online, I found there was no one universal solution for the problem of searching multiple excel spreadsheets online, so I decided to write my own excel spreadsheet that searches other excel spreadsheets, that can be found here.
Please note it's only been tested in Excel 2010, but it should work in 2007 and earlier versions. If not, feel free to modify the code how you see fit.
The spreadsheet makes use of a custom userform and makes use of VBA code (which you're welcome to use for any purpose). Naturally, macros etc have to be enabled for this to work, and the form appears upon opening the spreadsheet (you can access the code by pressing Alt + F11, going to the userform, and double-clicking the 'Begin Search' button in the design window).
Full explanation of functions and features can be found on the Github readme, but it basically allows you to specify two text search terms to search for within a specified directory (that you can navigate to), it can search said directory recursively, and open spreadsheets that are password protected (so long as you provide the password).
It will search individual sheets in each workbook on a cell level search. Depending on workbook size, it can take roughly a second to scan each workbook.
It displays all search results in a side window, including any spreadsheets it failed to open. These results can be saved to a text file for later reference.
The userform should be relatively self-explanatory, however the readme for it on Github goes into great depth on how to use. Again, free to use, it's open-source.
In Excel 2003 you had an extra search option in the file menu where you were able to search through files. I can't find this option in 2007 anymore so I think it's gone.
If your have Vista or Windows 7 you should be able to use window's integrated search. In older versions you could install a search app like Windows Desktop Search, Google Desktop Search, Copernic, ... they're all free to use.
Disclaimer: I own this repo I made a tool here to search through multiple files in excel https://github.com/datmt/Multiple-Big-Excel-Files-Text-Search Works on all OSes