Step by Step Instructions.
So working with export for reimport files from CRM in Excel can be frustrating if you aren't planning on using them as intended by just updating fields, saving and reimporting.
Here are the steps you should follow to get the GUIDS.
1. Export to Excel for reimport.
2. Save the file.
3. Open up Excel and browse to the file and open it in Excel.
4. Once it is in Excel don't do anything except the next step.
5. Do a Save As and save it as a CSV file.
6. Close Excel, ignore the warnings.
7. Open up Excel, browse the file from step 5 and open it up.
8. You should see all the hidden columns, nothing is protected and all re-import setup has been removed.
9. All the GUIDS will be column A.