Exchange server installation

Hi, We are a service provider company and need some help to install and correctly configure a exchange server. The work must include: 1. Installation of Exchange server 2. Configuration to receive all emails for a given domain. 3. OWA configuration to access the mailboxes. 4.? Activesync configuration. 5. We are deciding at this moment what anti virus and anti spam solution to install... maybe it is going to be a software solution or perhaps an appliance solution, maybe a MX filter gateway provided by us. You must anticipate that some work must be done here. 6. POP3 connector configuration. 7. Support for extra configuration in case that any problem arises during working in production. Regards,