Difference between Campaign monitor and Email marketing director

I was just looking at email marketing director(http://www.arialsoftware.com/emailmarketingdirector.htm) and campaign monitor...and looks like there is absolutely no difference in the features of the software, apart that email marketing director is desktop software and campaign monitor an online one.

Can anyone advice or point any major difference in the 2!

Looking forward to replies.

Namita

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