Unable to send or receive messages for the Windstream  account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your user name and password for this account.

Server Error: 0x800CCC90
Server Response: -ERR [IN-USE] account is locked by another session or for maintenance, try again.

I get a pop-up box asking me to enter username and password, but when I do it does not accept it and just keeps popping up again asking me for them. Then I get this message when I close the pop-up box.

Thanks for any help.