Exchange email account was accessed from another computer

we are using exchange 2003. one of our user received the below mail today certainly. we never received such alert from our exchange server. I checked accountupdate.com but didn't impressed. if any one can verify this for me.

From: Email Admin [mailto:emailadmin@accountupdate.com]
Sent: Monday, December 31, 2012 8:35 PM
Subject: Your email account was accessed from another computer

Dear Customer,

Your email account was recently logged into from another computer,
mobile device or other location on this IP 222.58.225.153.

For your protection, Please take a second to update your records by
following the reference below

UPDATE HERE<http://accountupdateonline.uni.me/AccountUpdate.htm>

Once the information provided matches what is on our record, Your
account will work as normal after the verification is processed.


Sincerely,
Mail Service Team.