Users seeing old versions of site until refreshing and/or clearing cache

I assist with a website that has regular (sometimes subtle) daily updates. Lately a few users have complained that upon visiting the site, their browsers (IE & Firefox) have been loading a previously cached version of the site without the current updates. Usually a simple 'refresh' fixes the problem, but this morning I was on the phone with a user who wasn't able to view the current version of the site after several refresh attempts until finally clearing her cache. This seems to be a new issue that has been occuring more and more lately and doesn't seem browser specific, or specific to the user settings.
Is there a reason a browser wouldn't recognize a new version of a page, therefore loading a cached version? Is there something I can put in my HTML that will force a browser to load a new version of the page?
Thanks much.

Try 1 or 2 of these Meta Tags.
If cached version is older than the served page, browsers should display the served page.
     <meta http-equiv="Last-Modified" content="13 February, 2013 22:31:00 GMT" />
Tells browsers to not cache page:
     <meta http-equiv="pragma" content="no-cache">
Tells browsers to refresh page every xxx seconds (24 hours = 86400 seconds).
     <meta http-equiv="refresh" content="86400">
Nancy O.

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genmich wrote:
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Users seeing old versions of site until refreshing and/or clearing cache

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