Microsoft Outlook has a built in feature to process junk mail and send it to a "Junk" folder as a way to control Spam in your inbox. This is a great feature if you only read mail in one place, but for most users these days, mail is read on multiple platforms - smart phone, tablet, laptop, browser, etc. This is why we typically recommend filtering Spam in the "cloud" so the mail is filtered BEFORE it gets to your mailbox, and gets cleaned centrally before going to all your devices.
Technology Advisor Blog
We've recently started upgrading our Spam filtering platform, so it's time to post some updated instructions. These days Spam messages account for 80%-90% of all email sent worldwide, generating a lot of clutter and in some cases, security threats. We strongly advise filtering mail before it gets to your mail server, and many of our clients have signed up for Spam filtering services with us.
The latest security vulnerability is all over the news. Microsoft is working on a fix to address a flaw that could potentially allow hackers to gain remote access to systems. This flaw affects all versions of Intenet Explorer (about 55% of the browser market) and a patch is expected soon. If you're still running Windows XP, support has ended and there will not be a security patch.