1. Go to Start > Search > All Files or Folders.
2. Search for files named 'hosts'.
3. Select the 'hosts' file located in c:WINDOWS\system32\drivers\etc.
4. Open the file with Notepad.
5. Copy and paste the following lines at the bottom of the file:
69.25.50.190 ms12.mse7.exchange.ms
69.25.50.186 mail.mse7.exchange.ms
69.25.50.188 mail.mse7.exchange.ms
6. Save the file.