Any reason not to migrate an exchange server to Azure??

Ive had my eyes opened to Azure very recently and the the one thing that seems a great idea for customers with a large numbers of users who would like to use the cloud but not pay the per user cost of office 365 is to do this. Im thinking create a site to site vpn to azure dump up the exchange server and possibly a DC and hey presto, cloud exchange with thier existing licensing.

Seems like its too easy though, can someone tell me why not?
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AmitIT ArchitectCommented:
As far as I know. Microsoft recommend office 365 over Azure for Exchange. You also need to calculate how much you are going to pay for Azure. Use price calculator.

In long run, On-prem will be cheaper and you have better control to customize it. Especially, for large enterprise On-Prem is the best option.
plug1Author Commented:
But if you have a large multi site customer who currently all VPN into the main server and lose email access when their internet drops then this would be a better solution surely. Im talking 300 users on 1 server currently so office 365 would be about£1500 per month for Office 365.
AmitIT ArchitectCommented:
If internet is down, you cannot access any platform. Whether it is on prem or cloud based. For 300 user office 365 is better option. For me large customer means, users above 30k minimum.
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plug1Author Commented:
No if internet is down at head office but not the 30 other sites and the exchange server is on azure then its still available to the bulk of the company. And as I say this is a fully licensed exchange server so the costs compared to office 365 are very small.
AmitIT ArchitectCommented:
So, if internet is down at head office. I might focus on that first. If you have internet issue in your head office, what about user in head office, 90% your work force might be in head office and won't be able to access Azure. It is more design question, how you provide HA to your user. On-prem major advantage is, user can access email over LAN.

You might need to review and test each solution and see what is best for your org. Both cost and user wise.

Exchange comes under SaaS. The solution you are looking is IaaS.
plug1Author Commented:
Well in this case head office have aDSL fallback so they would still have access to the Azure exchange. Im really looking for a technical reason as to why this wouldnt work. Do you think it would work then?
AmitIT ArchitectCommented:
As per my experience office 365 is the right solution for you. As far as Azure is concerned, MS now supports it. However, you need to talk to MS, what level of support they can provide you.

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