My redesign should launch in a few months, and it's changing URLs from .asp to .htm (or possibly no extension at all.
I need to 301 the old .asp pages to the new URLs, and my site has about 100,000 urls.
What's the best way to do this? I can't do it in chunks, it needs to be done all at once.
I don't want to get any kind of penalty, but I'm sure sites with redesigns do this all the time... am i too worried, or is there a better way to handle this?