Microsoft 365 – geekmungus

Retrieve Active Sync Client Information

July 27, 2025 by Tristan Self

We are currently going through a migration from on-premise Microsoft Exchange servers to Microsoft Exchange Online (Microsoft 365). We needed to determine what ActiveSync clients were in use to be able to provide guidance to users of what to do. So I wrote a simple script that retrieves all the mailboxes (that are enabled) and … Read more

Exchange Online IMAP, POP3 and SMTP Credentials Flow Testing (OAuth)

April 12, 2025 by Tristan Self

As a test we are using OpenSSL to perform some credentials testing using an Enterprise Application configured in Microsoft 365 to connect using IMAP(S) and SMTP via OpenSSL to validate how OAuth modern authentication works. Create Enterprise Application Firstly we create an Enterprise Application, we are going to be using Win64 OpenSSL v3.3.3 Light on … Read more