SQL Server 2005 xp_sendmail: Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Micros

Usage of SQL Mail is quite common within SQL Server environment, recently I have involved at one of the client's site with the error: Msg 17930, Level 16, State 1, Line 0 xp_sendmail: Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client. Further details on the issue the server (Windows 2003) has been upgraded from SQL Server 2000 to 2005, no issues reported on database side except...(<a href="http://sqlserver-qa.net/blogs/tools/archive/2008/06/19/xp_5F00_sendmail_3A00_-Either-there-is-no-default-mail-client-or-the-current-mail-client-cannot-fulfill-.aspx">read more</a>)<img src="http://sqlserver-qa.net/aggbug.aspx?PostID=4484" width="1" height="1">