Ian Turner, corporate infrastructure manager for the council, said, "We knew that we needed a technology refresh and that e-government was on the horizon so we needed to update to a level that would deliver e-government."
Councils across the UK are currently working towards meeting the Government's 2005 deadline for making services available to citizens electronically.
Windows XP is likely to play a key role in exploiting emerging technologies for e-government such as Extensible Mark-up Language, for sharing information online, said Turner.
In addition to the 3,000 desktops, which had previously been using a mixture of Windows 95 and 98, the council is extending the migration to a small number of Windows NT 4.0 workstations. It is also migrating to Windows 2000 Server and Exchange 2000 as part of the project.
The desktop migration, which began in April, is being undertaken with software deployment specialist Altiris and is expected to be completed by Christmas.