data protector

hai all

I have one question

we are using windows 2003 standared edtion R2 64 bit with exchange 2007 standared in our office I have one Ho storage works ultrium tape drive for backup.The problem is i cant even install the data protector express siftware with this 64 bit OS. is there any other version is available for this OS?

if not can u suggest one good software for backup and restore of exchange mailboxes with this tape drive?

Thanks