"We have security as the number one priority, so that [release] date is totally security driven. We've established security checks all along the way," said Enrique Murray, Microsoft's Latin America marketing manager.
Windows .Net Server was scheduled for the first half of this year, but last month Microsoft postponed the launch until the second half.
In January, Bill Gates, Microsoft's chairman and chief software architect, launched an initiative to improve the security of its products.
"Now, when we face a choice between adding features and resolving security issues, we need to choose security," he said in a written statement at the time.
Areas in which Microsoft has promised an improvement in Windows .Net Server over the server version of Windows 2000 include the Active Directory, clustering capabilities, security features and systems management.