SPAMfighter Exchange Module - SPAMfighter Exchange Module is an easy-to-use yet highly configurable Exchange Spam Filter solution for protecting your Exchange Server and business from spam, viruses, phishing attempts and malware.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
123Together Hosted Exchange Server - 123Together Hosted Exchange server offers high quality mail server outsourcing.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
Apptix Hosted Exchange - Apptix is a cloud-based provider of unified communications, Exchange and SharePoint hosting.
PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.