In general, the Sun migration tool only needs five to ten minutes to migrate a normal user's actual data. The real migration bottlenecks occur in the following order:
Microsoft Exchange is the first bottleneck. In particular, Microsoft Exchange 5.5 on Windows NT 4 has several design issues that slow down the migration.
The second bottleneck can be your network.
The third bottleneck can be the migration machine if it is under-sized.
A real bottleneck is the capability of your help desk and the support team to correctly deploy Sun Java System Connector for Microsoft Outlook on to the user's desktop. This requires:
Configuration at the site level for Connector for Microsoft Outlook.
Delivery and deployment of the pre-configured Connector for Microsoft Outlook to the user's desktop. Such delivery requires a additional software in place at your organization, such as Microsoft SMS, or tools such as Alterys.
Modification of the desktop login sequence to ensure that the Connector for Microsoft Outlook is synchronized for the first time, just after the user migration has occurred on the back end.