Outlook Express出現錯誤訊息，原因不一定是本機用戶端發生問題，亦可能由於郵件伺服器或網路的問題。當出現錯誤訊息的時候，錯誤代碼的註解，可參考以下的列表：
0x8004210A : 當您在 Microsoft Outlook 2002 中嘗試使用「郵局通訊協定，第 3 版」(Post Office Protocol 3，POP3) 電子郵件帳號收發電子郵件時，可能會收到下列其中一個錯誤訊息:作業 'smtp server name - 傳送及接收中' 已報告錯誤 (0x8004210A)：'等待接收 (POP) 伺服器回應時，作業逾時。這個問題已經在 2003 年 9 月 5 日所發行的 Outlook 2002 Post-Service Pack 2 Hotfix 套件中獲得修正。
0x800C0131 : 可能是Folder.dbx檔案屬性錯誤(不是「唯讀」) 或損壞
0x800C013E : 可嘗試刪除Folder.dbx，讓Outlook Express重新建立，但重建後所有郵件都會放在收件匣內。
0x800CCC00 : 身份驗證(Authentication)未載入
0x800CCC01 : 認證(Certificate)內容錯誤
0x800CCC02 : 認證日期錯誤
0x800CCC03 : 使用者已連線
0x800CCC05 : 未連線到伺服器
0x800CCC0A : 郵件下載未完成
0x800CCC0B : 伺服器忙碌中
0x800CCC0D : 找不到主機(可能是SMTP伺服器設定錯誤，亦可能是對方伺服器出現問題，如電郵伺服器未啟動、對方的DNS伺服器死機等)。
0x800CCC0E : 連線到伺服器失敗，無法與主機建立連線
0x800CCC0F : 伺服器結束連線
0x800CCC10 : 伺服器無法辨認此郵件位址
0x800CCC11 : 伺服器無法辨認的Mailing List
0x800CCC12 : 無法傳送Winsock request
0x800CCC13 : 無法接收Winsock reply
0x800CCC14 : 無法起始Winsock
0x800CCC15 : 無法開啟Windows Socket
0x800CCC16 : 無法辨認使用者帳號或使用者帳號錯誤
0x800CCC17 : 使用者中斷操作
0x800CCC18 : 登入失敗(例如：不需要安全密碼認證登入，但卻設定了安全密碼認證登入)
0x800CCC19 : 作業逾時
0x800CCC1A : 無法以SSL建立連線
0x800CCC79 : 郵件伺服器(SMTP Server)不能確認寄件者的身份
另提供以下英文版本更詳盡的解讀錯誤代碼原因:
===========================================
0x800CCC00 LOAD_SICILY_FAILED Authentication did not load.
0x800CCC01 INVALID_CERT_CN Invalid certificate content
0x800CCC02 INVALID_CERT_DATE Invalid certificate date.
0x800CCC03 ALREADY_CONNECTED User already connected.
0x800CCC04 CONN
0x800CCC05 NOT_CONNECTED Not connected to server.
0x800CCC06 CONN_SEND
0x800CCC07 WOULD_BLOCK
0x800CCC08 INVALID_STATE
0x800CCC09 CONN_RECV
0x800CCC0A INCOMPLETE Message download incomplete.
0x800CCC0B BUSY Server or maildrop is busy.
0x800CCC0C NOT_INIT
0x800CCC0D CANT_FIND_HOST Cannot locate server.
0x800CCC0E FAILED_TO_CONNECT Cannot connect to server.
0x800CCC0F CONNECTION_DROPPED Connection closed.
0x800CCC10 INVALID_ADDRESS Address not known on server.
0x800CCC11 INVALID_ADDRESS_LIST Mailing list not known on server.
0x800CCC12 SOCKET_READ_ERROR Unable to send Winsock request.
0x800CCC13 SOCKET_WRITE_ERROR Unable to read Winsock reply.
0x800CCC14 SOCKET_INIT_ERROR Unable to initialize Winsock.
0x800CCC15 SOCKET_CONNECT_ERROR Unable to open Windows Socket.
0x800CCC16 INVALID_ACCOUNT User account not recognized.
0x800CCC17 USER_CANCEL User canceled operation.
0x800CCC18 SICILY_LOGON_FAILED Logon attempt failed.
0x800CCC19 TIMEOUT
0x800CCC1A SECURE_CONNECT_FAILED Unable to connect using SSL.
0x800CCC40 WINSOCK_WSASYSNOTREADY Network subsystem is unusable.
0x800CCC41 WINSOCK_WSAVERNOTSUPPORTED Windows Sockets cannot support this application.
0x800CCC42 WINSOCK_WSAEPROCLIM
0x800CCC43 WINSOCK_WSAEFAULT Bad address.
0x800CCC44 WINSOCK_FAILED_WSASTARTUP Unable to load Windows Sockets.
0x800CCC45 WINSOCK_WSAEINPROGRESS Operation now in progress.
0x800CCC60 SMTP_RESPONSE_ERROR Invalid response.
0x800CCC61 SMTP_UNKNOWN_RESPONSE_CODE Unknown error code.
0x800CCC62 SMTP_500_SYNTAX_ERROR Syntax error returned.
0x800CCC63 SMTP_501_PARAM_SYNTAX Parameter syntax incorrect.
0x800CCC64 SMTP_502_COMMAND_NOTIMPL Command not implemented.
0x800CCC65 SMTP_503_COMMAND_SEQ Improper command sequence.
0x800CCC66 SMTP_504_COMMAND_PARAM_NOTIMPL Command not implemented.
0x800CCC67 SMTP_421_NOT_AVAILABLE Command not available.
0x800CCC68 SMTP_450_MAILBOX_BUSY Mailbox is locked and busy.
0x800CCC69 SMTP_550_MAILBOX_NOT_FOUND Mailbox not found.
0x800CCC6A SMTP_451_ERROR_PROCESSING Error processing request.
0x800CCC6B SMTP_551_USER_NOT_LOCAL User mailbox is known, but mailbox not on this server.
0x800CCC6C SMTP_452_NO_SYSTEM_STORAGE No space to store messages.
0x800CCC6D SMTP_552_STORAGE_OVERFLOW Storage limit exceeded.
0x800CCC6E SMTP_553_MAILBOX_NAME_SYNTAX Invalid mailbox name syntax.
0x800CCC6F SMTP_554_TRANSACT_FAILED Transaction failed.
0x800CCC78 SMTP_REJECTED_SENDER This is caused by having the incorrect e-mail address in the Reply-To field.
0x800CCC79 SMTP_REJECTED_RECIPIENTS Server rejected recipients.
0x800CCC7A SMTP_NO_SENDER No sender address specified.
0x800CCC7B SMTP_NO_RECIPIENTS No recipients specified.
0x800420CB POP3_NO_STORE Mail cannot be stored on server
0x800CCC90 POP3_RESPONSE_ERROR Client response invalid.
0x800CCC91 POP3_INVALID_USER_NAME Invalid user name or user not found.
0x800CCC92 POP3_INVALID_PASSWORD Password not valid for account.
0x800CCC93 POP3_PARSE_FAILURE Unable to interpret response.
0x800CCC94 POP3_NEED_STAT STAT Command required.
0x800CCC95 POP3_NO_MESSAGES No messages on server.
0x800CCC96 POP3_NO_MARKED_MESSAGES No messages marked for retrieval.
0x800CCC97 POP3_POPID_OUT_OF_RANGE Message ID out of range.
0x800CCCA0 NNTP_RESPONSE_ERROR News server response error.
0x800CCCA1 NNTP_NEWGROUPS_FAILED Newsgroup access failed.
0x800CCCA2 NNTP_LIST_FAILED LIST command to server failed.
0x800CCCA3 NNTP_LISTGROUP_FAILED Unable to display list.
0x800CCCA4 NNTP_GROUP_FAILED Unable to open group.
0x800CCCA5 NNTP_GROUP_NOTFOUND Group not on server.
0x800CCCA6 NNTP_ARTICLE_FAILED Message not on server.
0x800CCCA7 NNTP_HEAD_FAILED Message header not found.
0x800CCCA8 NNTP_BODY_FAILED Message body not found.
0x800CCCA9 NNTP_POST_FAILED Unable to post to server.
0x800CCCAA NNTP_NEXT_FAILED Unable to open next message.
0x800CCCAB NNTP_DATE_FAILED Unable to display date.
0x800CCCAC NNTP_HEADERS_FAILED Unable to display headers.
0x800CCCAD NNTP_XHDR_FAILED Unable to display MIME headers.
0x800CCCAE NNTP_INVALID_USERPASS Invalid user or password.
0x800CCCC2 RAS_NOT_INSTALLED RAS/DUN not installed.
0x800CCCC3 RAS_PROCS_NOT_FOUND RAS/DUN process not found.
0x800CCCC4 RAS_ERROR RAS/DUN error returned.
0x800CCCC5 RAS_INVALID_CONNECTOID Connectoid damaged or missing.
0x800CCCC6 RAS_GET_DIAL_PARAMS Error getting dial settings
0x800CCCD1 IMAP_LOGINFAILURE Login failed.
0x800CCCD2 IMAP_TAGGED_NO_RESPONSE Message tagged.
0x800CCCD3 IMAP_BAD_RESPONSE Invalid response to request.
0x800CCCD4 IMAP_SVR_SYNTAXERR Syntax error.
0x800CCCD5 IMAP_NOTIMAPSERVER Not an IMAP server.
0x800CCCD6 IMAP_BUFFER_OVERFLOW Buffer limit exceeded.
0x800CCCD7 IMAP_RECVR_ERROR Recovery error.
0x800CCCD8 IMAP_INCOMPLETE_LINE Incomplete data.
0x800CCCD9 IMAP_CONNECTION_REFUSED Connection not allowed.
0x800CCCDA IMAP_UNRECOGNIZED_RESP Unknown response.
0x800CCCDB IMAP_CHANGEDUID User ID has changed.
0x800CCCDC IMAP_UIDORDER User ID command failed.
0x800CCCDD IMAP_UNSOLICITED_BYE Unexpected disconnect.
0x800CCCDE IMAP_IMPROPER_SVRSTATE Invalid server state.
0x800CCCDF IMAP_AUTH_NOT_POSSIBLE Unable to authorize client.
0x800CCCE0 IMAP_OUT_OF_AUTH_METHODS No more authorization types.
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