Why aren't emails ending in the junk email folder?
For emails to be deposited to the junk email folder rather than the inbox you need to make sure that this functionality is enabled at the client mailbox. But before doing this make sure that IMF is also correctly configured at the Exchange System Manager. See more details from: How do I configure emails to be deposited to the junk email folder?
If you already verified the Exchange System Manger settings, then check that the junk email folder is enabled at the client mailbox. This can be done either through OWA or through scripting.
Through OWA
Open OWA and select Options (shown in the lower left corner of the image that follows)
Scroll the Options in the right pane and identify the Privacy and Junk E-mail Prevention section. Thick the Filter Junk E-mail checkbox. Click on Save and Close button to save changes.
Through Scripting
Evan Dodds, a Program Manager in the Exchange Admin/SysMgmt team, provides an excellent script for enabling the Junk Email folder. The script must be fed with a text file listing the mailboxes for which the folder is to be enabled. You will also need an account having the necessary rights over the mailboxes being accessed. For a copy of the script and complete details check his article IMF and the Junk E-mail folder in Outlook
ExchangeInbox.com also includes a series of articles that discuss in great detail all the issues relevant to Junk E-mail folder enablement:
Centralizing Junk Email Folder Administration
Enabling/Disabling the Junk Email Folder
Bringing Together the Exchange Anti-Spam Cocktail
As you will notice this is an area where Exchange could provide better configurability. Until then these are the best solutions available.
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