Most RecentMost ViewedMost LikesSerial number change, loss of attachments I wanted to get an older invoice for warranty purposes and they are all gone. We had a change in serial number and a few issues since then. What can we do to get them back? MYOB AO - Serial Number Hello, I have two MYOB AO serial number, but currently only using one. How and where can I check which serial number been used? Thanks