What service do I need to be able to let my users use Office 365 Cloud Excel - excel

I am working on an accounting system where the system will generate an excel file using a template and then open it using embedded Office 365 Excel. I can do this with my personal account where I would use the OneDrive API to create an excel file and then use the Embedded option in the OneDrive to generate the iframe link and use it on my website. However, the iframe url exposes the auth token though which could be misused by the users.
In future when we have real customers, I would want my users to be able to edit the excel file with their own Office 365/sharepoint account (that we would create for them during onboarding). I believe embedded excel option is not available for business users of Office 365, and I learned that you could do that with sharepoint though for business use cases. What service do I need? Maybe sharepoint but I dont know what else I need and how to make the integration work.

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How to get SharePoint Online List data from Outlook VSTO Addon

I've developed a VSTO add-on for Outlook that my company uses which connects to a SQL database to read/write data. I'd like to change the data source to SharePoint Online since all employees have M365 accounts. This will also allow the add-on to operate outside of the corporate network.
If I setup a SharePoint online site with a few lists, is there a way to have the Outlook VSTO Add-on read/write from the lists?
Also, since the Outlook client is already authenticated, is there a way to bypass any sort of authentication and use the already authenticated Outlook client when talking to SharePoint?
No, you need to consider your add-in as a standalone .Net based application. You can use the SharePoint client object model (CSOM) to retrieve, update, and manage data in SharePoint. Read more about that in the Complete basic operations using SharePoint client library code article.

Using Office 365 API with only one account

I am trying to use the Office 365 API to write events to the calendars of anyone at our organization. This should not involve the users logging in to Office 365 at any point. The events to add are written out at various points during the day (when the user who would own the event may not even be at a computer), so the per-user token approach doesn't even make sense.
It appears that Microsoft provides an alternative that uses a service account. This account can be used to write to any user's calendar (or sending email as any user, etc.). However, I can't find any documentation on doing this. Could anyone provide a link to it?
I found a blog post on this topic: http://blogs.msdn.com/b/exchangedev/archive/2015/01/21/building-demon-or-service-apps-with-office-365-mail-calendar-and-contacts-apis-oauth2-client-credential-flow.aspx
Also, if you aren't using Microsoft's client library for this (for example, if you use linux), you'll need to see this too: Office 365 Rest API - Daemon week authentication

Using Office 365 login as identity provider for my web app

I want my users to be able to connect with same email/pass combination in reporting system for my company as they use for Office 365 and outlook.
Reporting system is in my server, simple PHP engine and i don't want to mess with double login info for every user and for every system. So far i couldn't find any solution how to use O365's login/session. So i wonder if it is possible at all and how?

Retrieve Office 365 directory information from SharePoint online

I was wondering if is it possible to retrieve Office 365 directory information (i.e. security group membership) from SharePoint online programmatically (for example through a workflow custom action)?
By the way, I am not looking for retrieving Sharepoint group membership information.
I know the custom development is pretty limited with SharePoint online since the code has to run as a sandbox solution. Is there any web service or any another solution available?
I have been looking for information about this matter but I could not find anything so I guess there is no way to do this.
In our case there is an active directory synchronized with office 365. So we will use a powershell script to read data from AD and update a sharepoint list every day.
Then we will be able to use this data from custom code (like a workflow custom action).

Read data from Office 365 Active Directory

With the release of Office 365 can someone tell me the support available for custom visual sandboxed web parts created using Visual Studio 2010 SharePoint Power Tools that fetches an Office 365 active directory attribute values for a particular user? E.g. If my company already has existing users in a local Active Directory environment when I subscribe to Microsoft Office 365, there are tools for synchronizing those users to Office 365 directory. Let say I have synchronized my local Active Directory to Office 365 Directory, now is it possible to programmatically or OOTB way to read Office 365 directory attribute’s value for any Office 365 Directory user? I have a custom attributes added to my local Active Directory one of the attribute is “CC Number” and I want to get the value associated with this attribute for some XYZ user.
We have an Office 365 SharePoint application to which we would like to add either (or both) a custom sandboxed web part and a OOTB web part that only reads a data from an Office 365 Directory for respective Office 365 directory user.
Is this type of functionality supported with the first/current release of Office 365?
it's a really common scenario that organizations will move parts of their systems into the Microsoft Cloud by using Office365. In order to get rid of the additional AD management overhead you have to build a federation on AD level.
You need a SecureTokenService which does the authentication for your users. Microsofts implementation of STS is ADFS (ActiveDirectory Foundation Services) which could easily be plugged into an existing AD structure. Your AD has to be 2008 I think.
There is a good ebook from Dominick Baier and some other security guys available. It's called "Guide to claim based identity", you can read it online on http://msdn.microsoft.com/en-us/library/ff423674.aspx or there is anywhere a download it think... can't remember sry.

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