My company decided to get a new website, while retaining the same domain (e.g.,
mycompany.com). We are currently using Joomla (still active), and the new website will be a self-hosted WordPress. Since
mycompany.com is already well-indexed in Google Webmaster Tools & Analytics, I'm sure there will be a lot of problems if I just point the
mycompany.com domain to a new site. I guess a 301 redirect is certainly not an option since the whole site structure will be different.
I can expect some problems, but at least I want to minimize the impact to site ranking & index, also to real visitors. Can anyone suggest the safest way to do this?