I migrated my site last week from an old
.aspx framework to a new site hosted via WordPress.
The domain name is the same and I am seeing no errors when I test and submit the sitemap via Google Webmaster Tools. However, Google Webmaster Tools is showing that my indexed URLs dropped to ZERO the day after the switch, and it has not yet picked back up (the blue bar graph is listed at 448 URLs, there is no longer a red bar graph).
I still see my URLs in the SERPs, but much lower than before the move, and so a lot less Google traffic. How can I know for sure if something is going wrong? I can't seem to find anything to support this matter.