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I have 5 pop cox accounts in Outlook. About 10 times a day it will ask me for the log/pass. It's always the same....for whatever reason Outlook is timing out or cox is not getting my credentials. Sometimes O will ask for only 1 and sometimes it will ask for 4 in a row.
It's been going on for months.
Actually I re-read your second post and noticed you said your wife was having the same problem, is that on the same computer or different computer?
On top of the repair, Microsoft also has a .PST repair tool. See here.