You can submit spam messages directly to Microsoft by using the junk@office365.microsoft.com email address, and false positive (non-spam) messages by using the not_junk@office365.microsoft.com email address.
For junk forward your message to: junk@office365.microsoft.com
For phishing scams forward you message to: phish@office365.microsoft.com
For more information, see Submit spam, non-spam, and phishing scam messages to Microsoft for analysis.