[geff82]

I have an outlook.com account, too and having a look at the Spam-folder is as important as looking at the Inbox. Too many important mails get missing with outlook

[account42]

Worse, too many emails don't even get delived to Spam by Microsoft. Being able to tell people to check their spam folder would be a blessing.

[eddyg]

Because WAY too many people use the “Report Spam” button on emails that are not actually “spam”. Gmail has the exact same problem.