Microsoft Customer Services 1-877-424-6647
A few tips to make sure you identify correctly the bug are.
1). See the error. you can get the user to send you a few screen captures or even use remote connection to see the error by yourself .This is easy if you spot the error, but not if it comes from a user, in that case see if .
2). Reproduce the error. You never should say that an error has been fixed if you were not able to reproduce it.
3). Understand what the expected behavior should be. In complex applications could be hard to tell what should be the expected behavior of an error, but that knowledge is basic to be able to fix the problem,.
4). Validate the identification. Validation can also lead to situations where is not necessary or not worth it to fix the error.