Graph API Developer–Programmatically get the Outlook categories defined for the user using Graph API

Well, we use Outlook/Office 365 a lot and sure most of them uses Categories. Traditionally, you might have used MAPI/Outlook Object Model/EWS API to retrieve these categories. This time, lets we use Microsoft Graph API to programmatically get the Outlook categories that have been defined for the user. First i make the Request: GET https://graph.microsoft.com/v1.0/me/outlook/masterCategories…

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Developer: Outlook COM Add-in and Large Address Aware

Starting from build 16.0.8528.2147 (Version 1709) of the 32-bit version of Outlook 2016 for Windows has been updated to be Large Address Aware (LAA). This increases the maximum address space available to Outlook from 2 GB to 4 GB when it is running on a 64-bit version of Windows. This is key to improved graphics…

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Office.js debug: Office add-in throws “Sorry, we couldn’t load the app because your browser version is not supported”

One of the ISV pointed out that they see the following error with Office Add-ins that they develop. It throws error “Sorry, we couldn’t load the app because your browser version is not supported. Click here for a list of supported browser versions.” During the investigation we noticed the end user’s browser (Internet Explorer) is…

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Office Debug: Office add-ins are not displayed correctly in Outlook

Recently one of the ISV app developer reported that after they update Microsoft Outlook to version 1809 (build 10827.20181) or later versions, data from some Office add-ins may not be displayed correctly or may be missing from the user interface of the add-in within Outlook. Specifically in their case, they used IE Control hosted in…

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Office.js web add-in throws HTTP 401 Unauthorized

One of my dev customer, created Outlook Web add-in (using Office.js/JavaScript) and tried calling EWS call (mailbox.makeEWSRequestAsync method). It throws HTTP error 401 for mailbox.makeEWSRequsetAsync() method. They noticed the error or behaviour when they tested with Outlook on the Web and Outlook Web Access for devices. The API call throws, the following HTTP error: “The…

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Graph API : Subscription lifetime changes for Outlook resources

If your application uses user tokens to create subscriptions to Outlook resources, then you need to update your apps as needed to handle this scenario. This only applies to applications that use user tokens to create subscriptions. Applications that use app tokens to create subscriptions are not affected by this change. Existing applications do not…


Microsoft Graph API developer – Using GetSchedule API to get free/busy availability information

Now you can use the GetSchedule API (when I publish this article, its available in /beta endpoint) to get the free/busy availability information for a collection of users, distributions lists, or resources, for a specified time period. You can use it simply by calling, POST /me/calendar/getSchedule POST /users/{id|userPrincipalName}/calendar/getSchedule Let me play with this API call…

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Office 365 Developer – Get the Personal Contacts with Microsoft Graph API

As you aware Outlook contacts lets you store personal contacts’ data, and is part of the Outlook messaging hub in Office 365. Through Outlook, you can manage emails, schedule meetings, find information about users in an organization, initiate online conversations, share files, and collaborate in groups. So now with Microsoft Graph API you can get/pull…


Programmatically created email with attachment shows fields garbled

In recent times I was working with this developer customer. They created a custom application using Outlook Object Model (OOM) API – their app tries to create a new message programmatically with attachments. They notice the newly created items fields (such as the CC, BCC and TO) overlaps or garbled. Based on my tests with…


Office Developer: Difference between Office Web addin vs COM/VSTO addin

COM or VSTO add-ins are earlier Office integration solutions that run only on Office for Windows. The major difference what you see is that COM addins will be running in the user device or in the Office Client. The new Office Add-ins don’t involve code that runs on the user’s device or in the Office…


Office 365 Developer: Build add-ins for Microsoft Outlook

In this video you will see Petra provides a brief overview of the Outlook add-in platform and its capabilities. The add-in platform helps developers create native Outlook solutions, so users can get more done within Outlook. In short you can,- Learn what makes up an add-in- Get a high-level look at how to build one-…


Developer Guidance: Which endpoint should i use Microsoft Graph API or Outlook REST API?

With reference to what i blogged earlier, i get similar queries from app developers to choose Microsoft Graph API or Outlook REST API endpoints when they develop application related to Outlook APIs. Microsoft recommends using the Microsoft Graph API whenever possible. – The Microsoft Graph APIs include more features than just Outlook-related APIs, including OneDrive…


Office 365 Developer–Outlook actionable messages

In this video training, learn how to transform your workflows into actionable messages to engage with your users and make them more productive! Whether you are filling out a survey, approving an expense report, or updating a CRM sales opportunity, Actionable Messages enable you to take quick actions right from within Outlook and Teams. Developers…