Create Outllook appointments from ASP.NET MVC applications

I'm working on AS开发者_如何学GoP.MVC 3 web site and need to automatically create Outlook appointemnts, events, reminders etc from it. I've googled a bit and read some posts here and find the following options:

1) Create iCal files and ask users to execute them. Not acceptable for me because appointments can be created via Web Interface from any device (e.g. Android, iPhone etc) with no Outlook installed.

2) I'm not sure it can be realized, but if my users will login to my site via their domain password (SSO) will I be able to create appointment for logged in user via Outlook App installed on the server or via exchange server somehow?

3) Alternatively can I use some predefined exchange user that will create tasks, appointments and events in outlook for logged in used?

4) Any other options can be here?

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On account of the fact that this works: http://w3mentor.com/learn/asp-dot-net-c-sharp/c-interoperability/sending-mail-using-outlook-in-c-asp-net/ and this works: http://msdn.microsoft.com/en-us/library/aa168022(v=office.11).aspx then I would say that option 2 is definitely doable.

iOS 3 and above lets iCal files work, they don't on Android though, as you say.