For all people holding a current MCSA and MCSE certification on windows 2003.
Microsoft has opened a website to register for a upgrade exam voucher for 40 percent savings to apply to the first windows Longhorn exam.
you need to register for this voucher before June 30th and also need to hold the credential of MCSA / MCSE by that time.
For the people that are still working on their MCSE or MCSA this is also the time to spend some more time to finish it now, so you can also profit of this offer.
for more info see the following website: http://www.microsoft.com/learning/mcp/upgrade/ws2003/offer/default.mspx#LONGHORN