where can you find saved documents which was directly edited from email attachments?

retrieve missing saved documents:

If you open email attachment and then edit that file directly and save it, the file by default stores under temporary cached location.

for windows 7: locate the file at C:\Users\{authenticated username}\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\

for XP: C:\Documents and Settings\{authenticated username}\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\

Check the file by sorting the date. It should be there.