Why does mail stop working?

Why does mail stop working when it has worked fine for years?

OK, thank you.  I use apple for e-mail.  I have an @me address and I have long subscribed to mobile me, which has recently become icloud.  Yesterday the @me mail account appeared to stop recognizing my e-mail password for my primary mail account on my two imacs but not on my ipad.  The most recent e-mail I have received on my imacs is 7:16am yesterday, but I know from my ipad that I have received numerous e-mails since then.  I have other mail accounts, including one for the school where I teach.  I am receiving e-mail on the school account ok.
I made no changes to my password or otherwise for my primary mail account any time recently.  I also still have my @mac address.
Generally, I do not understand icloud.  I do not understand how to sync information across computers.
When I go to preferences in mail and I click and accounts and account information, I do not understand anything that I see there.  When I try to re-type my password, there seems to be no way to save it except to switch to another mail account.  I know from past experience that if I attempt to fix whatever might be wrong with mail I do not know what I am doing.
Any information would be helpful.  Thank you.

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