Transfer Joomla Website

We need to transfer a existing Joomla website from our current host onto a new hosting account. The new host is a windows host and the current host is a unix host - this should not be a problem but we don't have experience in this area. You will need to make sure everything on the new website is working correctly before compleation of the project. If bidding please give examples of previous work highlighting your experience or expertise in the joomla CMS. Project to be compleated by Wednesday 15th August.