Developer: Office Add-ins community call @ April 10, 2019

The Office Add-ins community call is our monthly event for developers to connect in real-time with the folks who are building the Office JavaScript APIs. We’ll share updates about new Office JavaScript APIs, provide tips about useful tools, samples, and resources for developing Office Add-ins, and feature a technical deep dive on a specific topic….

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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…


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…


Office.js: MakeEWSRequestAsync throws “The request exceeds the 1 MB size limit. Please modify your EWS request”

One of my customer created Outlook Web add-in (Office.js) and when he calls mailbox.makeEwsRequestAsync method. But they got the following error “The request exceeds the 1 MB size limit. Please modify your EWS request”. At the app level, the developer is making the call from web add-in to create a mail item in drafts folder…


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…


Understand more about Office.js, it’s add-in runtime environment and Internet Explorer protected mode!!

In addition to the earlier blog post, you can refer the following: – Microsoft Office addins using the Apps for Office platform are designed to run in isolation, using a low rights sandbox. – Several features, such as the task pane view, use web views provided using Internet Explorer APIs.  – To ensure these components…


Debug: Outlook office addin (apps for office) fails to load, errors out

Recently one of my developer customer reported that he designed a new Outlook addin (apps for office) which fails to load and it throws the error “This app could not be started. Close this dialog to ignore the problem or click “Restart” to try again.” During troubleshooting we noticed that this issue occur because protected…

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Office Developer: Request from Office for Apps going to ajax.aspnetcdn.com getting a 502 error?

In recent times, i was working with this customer where they created an Outlook add-in (Office for Apps/Office.js). They noticed that a request from Office for Apps going to ajax.aspnetcdn.com getting HTTP 502 error. During debugging (network sniffs) we noticed that issue happens that the URLs were blocked by their AV, Proxy Server settings. On…


Training: Advanced Office Add-in Development with Outlook

All of us spend a significant amount of time in email. Want to see how to build custom mail add-ins that can deliver a more productive experience in Outlook? Check out this session, and get ready to make mail better through add-ins. In this session “Advanced Office Add-in Development with Outlook”, you can learn how…