[Bug 914991]

[M-wada]

(In reply to Rich Gray (:rbgray) from comment #78)
> When I initially started 2.7b4, my third news account, changed its name from the former value of news.individual.net (or just "individual.net") to
> rbg_sm+graysmail.comIndividual.netrbg_sm+graysmail.com.

Who changed? What kind of name at where was changed?
If you changed Server Settings/Server Name:, it's saved in realhostname and is used for server access. If this setting is changed, all news articles is downloaded again even when difference is server name only(all newsgroups are common), because abosolutely different news server. 
hostname is not changed once defined for any serverX.type. And password  manager's key=hostname instead of realhostname and I think it's applicable to News too. Please be careful in understanding phenomenon if userid/password is relevant and you changed Server Name: setting.

Following is my news account definitions in my Tb profile for testing.
> user_pref("mail.server.server5.name", "news1 on news.mozilla.org");
> user_pref("mail.server.server5.type", "nntp");
> user_pref("mail.server.server5.hostname", "x.x.x");
> user_pref("mail.server.server5.realhostname", "news.mozilla.org");
> user_pref("mail.server.server5.newsrc.file", "C:\\ ... \\News\\x.x.x.rc");
>
> user_pref("mail.server.server7.name", "news.opera.com");
> user_pref("mail.server.server7.type", "nntp");
> user_pref("mail.server.server7.hostname", "news.mozilla.org");
> user_pref("mail.server.server7.realhostname", "news.opera.com");
> user_pref("mail.server.server7.newsrc.file", "C:\\ ... \\News\\news.mozilla.org.rc");
Because of above setting, I frequently try to look into \news.mozilla.org.rc when I want to see .rc file content for news.mozilla.org :-)

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Title:
  Thunderbird sometimes marks whole newsgroups as read

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