What are the restrictions on Office 365 (SharePoint Online) in SharePoint 2013 Environment -

as there drastic change in architecture sharepoint 2010 2013, know restrictions developer while developing solutions/apps office 365.

in sharepoint 2010, sandbox solutions allowed on office 365, in sharepoint 2013 sandbox solutions depreciated , app model introduced. glad if can throw light on allowed , restricted on office 365 in new 2013 environment.

sharepoint 2013 game changer, starting fact possible use framework 4.5 and, since new release of visual studio 2013, it's possible use mvc. developing point of view have know there 2 flavors:

1. sharepoint hosted. in case, whole application installed within microsoft servers. because of this, must use client object model , javascript. no server code @ all. configure sites, libraries, lists, etc 365 , access information using sharepoint javascripts libraries. if familiar js ans sp js won't have problem.
2. autohosted. in case can choose between azure or hosting (provider hosted) in both cases can use more traditional aproach, server code, classes, aspx , on. difference when deploy application, in case app installed reference in 365 , code in hosting provider. in fact application displayed in 365 within iframe. keep in mind dealing lots of cross domain scripting.

last not least, have 1 final flavor, it's not 365, sharepoin onpremise, in case own sharepoint, create, manager, develop or deploy whatever want. similar current sp2010 model, so, guess can do.

for more information:

• http://msdn.microsoft.com/en-us/library/office/apps/fp179930.aspx
• http://blogs.msdn.com/b/amigan/archive/2012/12/10/part-2-introduction-to-sharepoint-2013-app-model.aspx