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There is nothing worse than being pushed to a service that's not technically part of the website and being met with an alien gui. If you're bringing another, developed service in (for example, The Meeting Factory on Lincoln's site - http://tmf.lincoln.gov.uk), skin it up to look like the rest of your site.
Don't spend £2.8mil on your website - use third party applications and services where possible (Google etc) to add value to your site without the need for scoping new features into your already bloated CMS.