Understanding App Development and Hosting options

I am having some confusion around Provider/ Autohosted App.
Below is my understanding. Please correct my understanding or misunderstanding of the following:
1. We cannot develop Apps on SharePoint Online which will have server side code. The Apps developed on SharePoint online can only use html5 and javascript, not even CSOM?
2. Auto hosted / provider hosted apps can be developed on any system where Visual Studio Express / Professional / Premium/ Ultimate is installed. It doesn't require SharePoint on the system. It however requires IIS to help us in debugging and testing
3. On App development environment, even though it does not have SharePoint installed, we can write code using server object model
4. We need Azure or provider hosted environment only to host the app and not for development purpose
5. It is best practice to keep the hosting environment separate from development environment
6. The only difference between Auto hosted and Provider hosted environment is that in case of Auto hosted , everything is managed by SharePoint while Provider hosted has to be managed by IT.
7. Auto hosted app will work equally well on Provider hosted app. A provider hosted app can be installed on auto hosted app and vice versa
8. We do not have control over the auto hosted app which is installed on Azure. If we want to unistall or upgrade, we will need to write remote event receiver.
9. We have control over provider hosted app, meaning that, IT can manually uninstall or upgrade or do the same using remote event receiver.
10. Remote event receiver's can be created either as Auto hosted or Provider hosted app
11. Though we cannot create Apps with server side code on SharePoint online, but we can launch (host) apps that have server side code, created as auto hosted or provider hosted app.

Hi Mokhtar,
Thanks for the reply. It is a news that auto-hosted is removed now. Some of my questions related to Office 365 and Provider hosted are still not answered. Mainly need some clarifications on the following:
1. Can Provider hosted apps be developed on any system where Visual Studio Express / Professional / Premium/ Ultimate is installed. Is SharePoint required on the development system? If we need SharePoint, for what purpose do we need SharePoint? Does
SharePoint have to be on-premise / provider hosted. Can it not be SharPoint online?
Yes, you can develop the SharePoint Hosted or Provider hosted apps without having SharePoint installed, you can use Visual Studio 2013 Professional/Premium/Ultimate. If you are using Visual studio 2012, you need to download Office developer tools for
Visual studio.
http://blogs.msdn.com/b/somasegar/archive/2013/03/04/now-available-office-developer-tools-for-visual-studio-2012.aspx
2. Even though the develpment system does not have SharePoint installed, can we still write code using server object model ?
No, you cannot write server object model code without SharePoint Installed.
3.Is the provider hosted environment required only for the purpose of hosting the app or do we need it for development purpose also?
Provider hosted environment is required to host the application such as ASP.NET application or PHP which required IIS. It can be Azure web site or your own server with IIS or Apache server installed.
4. Is it a best practice to keep the hosting environment separate from development environment?
That depends, if you are just developing Apps you don't need the SharePoint Server, just you need to be connected to the SharePoint Server. If you need to develop sandbox solutions or farm solutions, then you need to have both on same server, VS &
SharePoint.
Even if you are developing console application with CSOM, you don't need SharePoint to be installed you just need SharePoint Client libraries.
5. Can we launch Apps with server side code (hosted on provider hosted app) on SharePoint online?
No, you cannot use the server side code in hosted or provider hosted app. You can use CSOM in provider hosted model.
Hope it got answered all your queries. One the good reference book is
Professional SharePoint App Development by Apress.
http://it-ebooks.info/book/2984/
Please mark it answered, if your problem resolved or helpful.

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<b>How to Participate</b>
(Please go to the SDN webinar schedule page to find more information)
Dial-in Information:
Date: Wednesday 25 August 2004
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Within the U.S., call: +1.888.428.4473
Outside the U.S., call: +1.651.291.0618
Password: NetWeaver04
WebEx Information:
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Date: Wednesday 25 August 2004
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WebEx Link: sap.webex.com
Replay Information:
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Toll-free: +1.800.475.6701
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<b>
About the SAP NetWeaver Know-How Webinar Series</b>
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