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It's surprising that the "W" word is completely absent from this post, particularly after the comments you got on your initial post about reserved instances back in March:

Is it safe to assume that Amazon will still be selling Windows EC2 instances this time next year?

Ismael Juma


A 30% discount is always appreciated. :) We were about to purchase a few reserved instances this week, but luckily that got delayed by a couple of weeks.

Looking into the future, I think it would be useful to be able to purchase reserved instances for 1 and/or 3 months. Some high-quality hosting companies provide dedicated servers on a monthly or quarterly basis (with better prices than on demand Amazon EC2), so I believe there's a gap to be filled there.



Unfortunate for only newly purchased instances since we just bought a batch about a week ago... Honestly it makes me think buying 3 year plans is a bad idea, if you buy one year you can switch to the price reduces that will occur on EC2 every once in awhile, if you purchase 3 year instances you get screwed... Something to consider when you force a long term commitment, but then have more short term pricing changes.

Dan Grossman

I just bought another reserved instance last week and more last month. Disappointing to find the price dropped but I'm locked into a higher one.


Is this the AT&T locked in pricing model?


Can you just tell us is there any indication of a Windows version soon. This AWS refusal to say anything about future work is really an obstacle to planning to run an operation on EC2

Jacob L E Blain Christen

I am still a bit new the the AWS so forgive me if this is answerable elsewhere: the instance type (m1.large, etc) can be selected in the purchase path but the AMI cannot be specified, am I to assume that the AMIs for reserved instances are pre-chosen? If so, what are the identifiers so that I may know more about them prior to purchase?

Dan Grossman


If you reserve an m1.large instance, then the m1.large instance you run for the most hours each month will be billed at the reserved rate.

It can be any m1.large instance, it can run any AMI, it can even have been started before you bought the reserved instance.

Amazon automatically figures out which instances can match what you have reserved, and picks the ones that would save you the most money to apply the lower pricing to.

You don't lose any of the flexibility of EC2 by reserving instances, you are just getting a discount on the hourly fees in return for committing to an upfront payment.

Emmanuel Marchal

The new pricing is nice as it makes the break-even for 1-y reserved vs on-demand at 5 months (used to be 7 months). The 3 years reserved break-even remains at 13 months so no change here. But it's always good to know that a 3-y reserved pays back after 13 months (note: these numbers are assuming 100% utilization, which might not be the case for everyone).


I just got couple of reserved instance last week before announcing the new plan, is there a way to apply discounts ??

Vivek Puri

I didnt really get the terms here. What is m1.xlarge, ...... as compared to what is listed in the pricing section here:

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