User Authentication settings in MS CRM

To ensure User Authentication works in CRM, users must have their Internet Explorer settings set up to allow it.

In IE go to Tools > Internet Options > Security > Local Intranet > Custom Level

and scroll down to the User Authentication options. Set "Automatic Logon only in Intranet Zone" or "Automatic Logon with current username and password".

MS CRM bypass the "The webpage you are viewing is trying to close the window" issue

To bypass the "The webpage you are viewing is trying to close the window" prompt in Microsoft CRM, change your shortcut to:

http://crm/loader.aspx

where "crm" is your usually crm url.