Thanks so much for your prompt and helpful response. My problem with Entourage is that it keeps telling me that one or another of the three accounts I use can either not receive or not send. When I go into the account and re-enter the same POP and SMTP information, it manages the task, but transfers to the problem to one of the other two accounts. I've tested Entourage in a new User, and it sent and received just fine.
With Word, when I format a paragraph, the entire document reformats. This is fairly easily addressed by simply pressing command-Z to undo, so it's more an irritation than a serious problem. I tend to think that this bug is built into Word, because I've encountered it on other machines, with other installations. But things started getting unworkable when the program refused to allow me to modify a style. Sometimes, the style would just remain stubbornly as it was, totally unresponsive to the modification. In other cases, the modification would be applied to one instance of the style in a given document (e.g., Heading 3), but only partially to the others (e.g., all the other Heading 3's not bolded). When I select the partially modified heading and reapply the style, that heading doesn't respond, but the partially modified version is applied to the paragraph of text following the heading (which was in another style, e.g. Normal), and replaces the single heading that was originally modified correctly with the partially modified version. Complete chaos.
In the new User, formatting a paragraph continues to apply itself to the entire document, but the style problems appear to have disappeared.
Now that we know the problem is in the User, how do I go about fixing it? If the fix is to switch over to the new User, how do I transfer all my identities, documents, etc. from the old one? Wouldn't doing so also risk transfering the problems along with the docs?
Thanks again for your help, Diane.