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Both linux and windows reserved instances have the same deposit, so can I switch between the two?

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up vote 3 down vote accepted

Unlike normal on-demand EC2 instances (where the image decides the OS), the RESERVED instances cannot be changed after purchasing. To quote the official documentation:

Platform (e.g. Linux/UNIX, SUSE Linux, Windows Server, or Amazon VPC with either Operating System), Instance Type, Availability Zone, and term length must be chosen at purchase, and cannot be changed later.

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that really sucks! – Blankman Nov 14 '10 at 21:44

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