Just in case you run into it, Microsoft has done their customers another favor by adding a new "clutter" folder in Outlook 365 a couple weeks back. Unfortunately it chose to send all my client's voice mails there. Spent a lot of time troubleshooting the UM-to-email integration (SMTP, in this case), trying to figure out how it broke (it worked for a year) until we found all those v-mails hiding in the CLUTTER folder.