How can I install WordPress without losing all the indexed html pages?

ben c

New member
I want to switch to a clean new WordPress theme for a site, but Google has indexed 2500 pages from the old site (mainly due to a calendar module creating a new page for each day). How do I ensure all those pages remain accessible for Google, without throwing up a "Page Not Found" when someone tries to access it after installing the new WordPress theme. The current site is content managed and is running pHp.
 
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