Server Not Refreshing

I have some clients, not all that can not see new content posted to their web sites unless they go in and completely clear their browser cache. Simply hitting refresh on their web browser does not work.

I do not have proxy on in apache and I have Expire set to the following:

ExpiresActive On
ExpiresByType image/gif M60
ExpiresByType text/html M60

Are their any other directives I can put in apache? I understand ISP's are caching more and more stuff. I just have a bunch of clients that say they do not have to do this with other hosts, so I am at a loss as to what else should be done.

Any detailed answer you can give woulld be much appreicated..

 

 

 

 

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