Well, Exchange and Outlook accounts are technically Microsoft based accounts, so it would make sense to use the latest Microsoft icons for those (just as the latest Yahoo! icon is used for Yahoo! Mail, and Gmail icon is used for Gmail, etc.).
Well, Exchange and Outlook accounts are technically Microsoft based accounts, so it would make sense to use the latest Microsoft icons for those (just as the latest Yahoo! icon is used for Yahoo! Mail, and Gmail icon is used for Gmail, etc.).
So, are we talking about the mail account icons? If so, those have always been there, they just get updated to their latest ones with some iOS updates.