Raidstore DAS series is deal for Microsoft Exchange and SQL server for several reasons. First of all, it connects directly to the server host to dedicatedly provision disk I/O without any unnecessary file system or network stack overhead involved which might tradeoff performance & system stability, Compared to limited internal storage and it provides upto multiple Terabytes depending on HDD size used. For example, a 200 employee company each is assigned 10GB storage space adding up to 2TB overall, which can be easily satisfied by R-US-316 with 16 x 200GB HDD installed running RAID 5. Actually with this amount of storage its sufficient to serve to all application servers required in SMB environment (e.g. Web, CRM or others).