itcertkeys is providing 11 free practice questions for MCSA/MCSE exam-70-284. These are sample questions from the original study guide offered by them and are available in PDF format. The questions are also supplemented with explanations for the correct answers.
Start downloading it from here.
Pass-Guaranteed.com is providing a free demo test containing 10 questions for MCSA/MCSE exam-70-284. These are the questions from their 70-284 exam study guide. The free demo version is available at this link. Explanations to the correct answers are also given.
The full version of the Study Guide is available upon buying.
MC MCSE.com is providing free practice test for Microsoft Exchange Server 2003 (70-284) exam. The user has an option to select the number of questions from a pool of 50 questions and also the time period for the test. The test can be taken from this link.
Note: Registration is required to take the test.