Glen’s @ eMail Development Substack

How to Migrate from the EWS Get-Delegate Operation

With the release in preview of the Exchange Online Admin API recently this has unlocked a Migration path for those EWS apps that are stuck because of…

Nov 27 • Glen Scales

Reverse lookups to find information about a M365 Tenant from its TenantId

The Tenant ID is a crucial element in OAuth authentication. For single-tenant applications, this ID is typically incorporated into the token endpoint as…

Nov 20 • Glen Scales

EWS less than 1 year to go until retirement on Microsoft 365

In September 2023, Microsoft declared the retirement of the EWS (Exchange Web Services) API within Exchange Online (the Microsoft 365 online stack…

Nov 11 • Glen Scales

August 2025

Discovering a users Auto-Mapped and Shared Mailboxes and Autodiscover discussion

Back in 2007 two of new features on the block that where released along side Exchange 2007 where Autodiscover and Exchange Web Services.

Aug 20 • Glen Scales

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July 2025

Mark all messages as Read in a Folder using the Microsoft Graph API

Being able to mark all the messages as read (or unread) on a Folder is an existing EWS feature that has made it into the Beta endpoint in the Microsoft…

Jul 30 • Glen Scales

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Auditing in the Microsoft Graph Mailbox Import Export API

When I previously explored the new Mailbox Import and Export API in the Microsoft Graph, one of the observations I made was the apparent lack of…

Jul 1 • Glen Scales

June 2025

Work around for importing Mime messages into Exchange Online using the Microsoft Graph

One of the more vexing and grating issues when converting an EWS application to the Microsoft Graph to import messages (or other MIME content) into a…

Jun 16 • Glen Scales

May 2025

Using the Outlook Reaction's feature in the Microsoft Graph

The cloud hosting era, while delivering on its promise of rapid feature deployment, often presents a frustrating disconnect: these advancements aren't…

May 15 • Glen Scales

April 2025

Open Discussion and Examples for Exporting Calendar Appointments to CSV using Microsoft Graph PowerShell SDK

I’ve been posting a bit about the new Export/Import API in the Microsoft Graph recently but I received an eMail today about exporting calendar…

Apr 17 • Glen Scales

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Finding more details on the client (and app) that sent a particular email in the Sent Items folder using the Microsoft Graph

Administrators or developers often face the question of identifying the email sending method for emails in a specific mailbox (X).

Apr 1 • Glen Scales

March 2025

A first look at the new Import Export Mailbox API in the Microsoft Graph Part 3 - Importing Items

In the first two parts in this series I covered the basics of getting going with the Import Export API endpoint in the Microsoft Graph and in part 2 how…

Mar 12 • Glen Scales

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February 2025

A first look at the new Import Export Mailbox API in the Microsoft Graph Part 2 - Export Items

This is part 2 of my series on looking at the new Import and Export API in the Microsoft Graph.

Feb 25 • Glen Scales

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