New Exchange items of Interest
256352 Online Defragmentation Does Not Reduce Size of .edb Files
http://support.microsoft.com/?id=256352
255035 XADM: How to Recover Hard Disk Space from Exchange Server Databases
http://support.microsoft.com/?id=255035
Best Practices for Exchange Database Management whitepaper:
http://www.microsoft.com/exchange/techinfo/administration/55/BestDBManage.asp