I was dismayed after I took the plunge and installed build 10166 on my phone to see that custom e-mail alerts still isn't a feature in the Outlook Mail app. The same is true on the PC. Is this a replacement for the mail functionality in Phone 8.1? If so, it needs to allow us to select the alert tone for each account. I have four mail accounts on my phone including work. Work is more important so I need a distinct alert tone for that account so I can give it immediate attention.