A project I'm working on involves the creation of a new site that
will host around 80% of the content of an old one. The content
will disappear from the old site, and become solely available on
the new site that we're designing, while the old site will be
maintained for a period of time with that 20% of remaining
content. How could we redirect our users to the new site
if/when they land on the old one? The options that we have
discussed are:
1. Automatic redirection based on the google search -if it's
relative to the migrated content.
2. Lightbox/Prompt to every user who accesses the old site
with a link to the new site.
3. Allocating a good portion of the old site's homepage to
inform users about the new site.
4. A combination of the aforementioned.
All these have pros and cons. Any best practices or
recommendations for making the transition easier/natural for
the users?