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Andrew Abbate, MCSE Andrew Abbate has been in the computer industry for more than 10 years and is a specialist in AD and Exchange migration planning and implementations, firewall and security planning and implementation, Layer 2 and 3 switching, and wide area connectivity. Andrew possesses an MCSE/MCSA as well as holding certifications from numerous firewall, hardware, and software vendors. Andrew's experiences with companies ranging from 20 to 20,000 employees have afforded him a unique perspective on IT best practices.