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Microsoft Outlook provides you connectivity with your mail server in different ways such as POP3, SMTP, IMAP. You can configure your outlook email account for different incoming mail server and different outgoing mail server. If you have completed the incoming and outgoing mail server setting correctly with your Outlook email account then you can start sending/receiving emails in Outlook easily. Sometime, it creates trouble when you try to send any email, you receive some annoying pops up that Outlook asks for username password. When you hit cancel, an unexpected error message appears like as follows:
"Task 'Servername - Receiving' reported error (0x800CCC92) : 'Your e-mail server rejected your login. Verify your user name and password in your account properties. Under Tools, click E-mail accounts. The server responded: -ERR invalid user name or password.'"
However, when you send email, the email is sent successfully but frequently pops up a message box that asks for user name and password. This is really annoying problem that must be fixed immediately otherwise it may create some vulnerable situation in your Outlook program. Sometime, your sending email may be failure. Such issue often occurs with Outlook 2010, 2007 and 2003. The reason that Outlook asks for username and password may be due to incorrect email settings. It may also be due to corrupted outlook profile. In order to fix Outlook error 'ERR invalid user name or password.' follow the following steps.
If your email service provider has web access using browser too then you can try logging in using your compatible web browser. You can also try checking your account settings with Outlook Express. If are still asked for username and password even with several email application then it is problem with your email service provider. Hence, you need to contact your email service provider for your accounts related issue.
If it works fine with other email applications, it means there is problem with your Outlook. Therefore, you may need to create new Outlook profile. You also need to repair your Outlook in order to successfully correct the issue. You can use Scanpst.exe or comprehensive and reliable Outlook PST Repair tool to repair and recover your Outlook.

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