We have had problem with Outlook email account receving SBCGlobal.net account. There is not problem vice versa.
Outlook users could not get email right away untill two day later.
By the way, we have Exchange 2003 Enterprise running on Windows 2003 Standard and Outlook 2007 running on Clients' machine which is Windows XP operating system. TrendMicro is our anti-virus software.
Thanks so much and looking forward to hearing from you soon!