@COM5250N

For small sized organizations with up to about 30 users.
Also ideally suitable for larger organizations with multiple small branch offices.

@COM5300N  (on sale)

For small sized organizations with up to about 100 users.
Note: Due to End-of-Sale this model is now on-sale! (while supplies last) 

@COM5400N

For small and medium sized organizations with up to about 200 users.
Note: This model is the replacement model for the @COM5300N.

@COM5400N-RAID

For small and medium sized organizations with up to about 200 users.
With redundant hard drives.

@COM5500N  (end of life)

For medium to large sized organizations with up to about 1000 users.
With hot-swappable and redundant modules for the hard drive as well as the power supply.    Note: This model is "end-of-life" but still fully supported!

@COM5600N  (new)

For large sized organizations with up to about 5000 users.
With hot-swappable and redundant modules for the hard drive as well as the power supply.    Note: This model is the replacement fro the @COM5500.