Outlook 2010 keep asking for password but only on one account and on proxy

We are having a few issues with a few clients that have more than one account configured on their Outlook 2010, we use Office 365 here.

Some computers might have two or three accounts configured on their computers, but it won't stop asking for password for one account (different accounts on each machine), if we remove proxy configuration, works without a single issue. All email, Exchange, accounts are on the same domain.

Basically:


Accounts configured: mail1@contoso.com, mail2@contoso.com, mail3@contoso.com

Only keep asking for password of account mail3@contoso.com

Can't see this as a proxy issue since one or two accounts are working fine, but if we add another one, it does receive/send emails, but keep asking for the password as soon as Outlook is opened.

Password were removed from the vault already, issue continues.

July 7th, 2015 10:45am

Hi,

What proxy authentication method did you set? This issue may happen if it is set to NTLM. To see if you are using Basic Authentication or NTLM Authentication, open your account settings for the Exchange server via opening the account settings dialog, clicking More Settings button, selecting Connections tab, clicking Exchange Proxy Settings button. At the bottom of the dialog, change the proxy authentication to Basic Authentication.

Please let me know if this works.

Regards,

Steve Fan
TechNet Community Support

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July 7th, 2015 11:18pm

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