This is a pragmatic approach, DropBox! Use it and share it in the project, eventually it will be adopted.
- I have downloaded and modified a spreadsheet from http://office.microsoft.com/en-us/templates/
- You can download it here http://dl.dropbox.com/u/18883163/%C3%84renden.xlsx
- Created a DropBox account.(It's free upp to 2gb)
- Created a folder and shared the folder to all members of the project.
- Copy the spreadsheet to shared folder; it will automatically be synchronized to all members of the shared folder when the file is saved.
- Here is one of the most important steps. For each project there is a RSS stream that you can subscribe to; add the RSS feed to Outlook (or your preferred RSS reader that you use). If you don't have events shown in a way that you are used to, you will forget to check if the document has been updated.
- When somebody updates the excel spreadsheet you will get a notification in the Outlook client, and you can instantly see the changes in your synchronized DropBox folder.