I have a server that is about 5 years old and had Plesk 8.3.1 installed on it. We currently host about 80 or 90 web sites and hundreds of emails on this server. The server is running Windows 2003 SE. I am looking to upgrade to Plesk 10.x but it appears difficult to find someone with the proper knowledge to do this. Every time in the past we have upgraded Plesk, it breaks and does not upgrade efficiently. I hope someone has had experience doing this with little outage/downtime and without any data loss (email, web, database, etc).