Jan de Graaff has released the latest version of his SimpleBoard forum component for MOS 4.5. I updated the filebase to the latest version, which can be found  here. Please note, that this version is only for MOS 4.5 beta 1 and up as many things have changed and make use of the new api functions. Here is Jan's changelog:

• New, fully integrated Admin Area using native MOS API's
• Moderators: assign moderators to individual forums
• Review Posts: configure individual forums so that new posts must be reviewed prior to publishing
• Moderation is done entirely from the frontend
• Site Admins are always Moderator on each Forum
• Configurable email handling: Send email to Moderators on new posts in Forums they're assigned to, etc.
• NLS: National Language Support. Initially English and Dutch are supported
• Email hide: configurable between "display never" and "display to registered users only"
• All mos_ table prefixes are removed
• Lockable Forums: not only topics but entire forums can be locked
• Registered users can edit own posts, if allowed by admin in the configuration.
• Forum Descriptions: free format text to descibe the forums
• Show number of replies in the Category List
• Improved layout of different sections
• Alternating row colour support for better readability