ENTX: Hotmail Error 1503: The Server Is Temporarily Unable to Fulfill the Request (331985)

SYMPTOMS

When you try to use Microsoft Entourage X to access your MSN Hotmail, you receive the following error message, where username is your Hotmail e-mail address:

Could not receive mail from the account "Hotmail.com:username"
Explanation
HTTP error. The server is temporarily unable to fulfill the request.
Error: 1503

CAUSE

On July 16, 2001 the MSN Simple Mail Transfer Protocol (SMTP) servers were upgraded to protect against unsolicited commercial e-mail messages, frequently referred to as "spam." To continue to use your MSN account to send e-mail messages, you must also upgrade Entourage X.

RESOLUTION

To resolve this issue, download and install Microsoft Office v. X for Mac Service Release 1 (SR-1). This service release contains the changes that you must have to upgrade Entourage X so that it will work properly with your Hotmail account.
NOTE: You must install this service release to send e-mail messages.

For additional information about how to obtain the Office X for Mac Service Release 1, click the following article number to view the article in the Microsoft Knowledge Base:

323601 MACOFFX: How to Obtain and Install Office v. X for Mac Service Release 1 (SR-1)