Exchange SE Hybrid Licensing a consideration

In general, the topic of licensing at Microsoft is certainly not a simple one. Myths surrounding its interpretation and persistent rumors are constantly circulating. Therefore, I’d like to shed some light on a few things here.NOTE: This article is as of July 2025; changes and interpretations are subject to change at any time! I welcome …

Exchange Online get default calendar permissions

I frequently receive requests from customers who are dealing with the default sharing settings within the Exchange organization and don’t have a reasonable solution for it. Therefore, I sat down and wrote a small PowerShell script that can initially read the default permissions of all user mailboxes. In this case, default permissions refer to the …

IanaTimeZoneMappings.xml invalid Exchange after November 2024v2 SU

Anyone who runs the Exchange Healthchecker again after the November 2024v2 Exchange update sometimes finds an error that is not pretty but also not completely critical. Here, I really wonder where the quality control is for the updates. This error should be quickly noticeable and is also quickly fixed. NOTE: Restarting IIS is required, so clients …

FullAccess Permissions in Exchange Online with additional information

In mid-March, I received an email from a reader (Sebastian) asking if it was possible to read out all full access permissions and then enrich this information with additional details. Specifically, it was about the department, meaning that the mailbox, authorized user, and the department of the authorized user should be output to a CSV …

April 2024 Exchange Server Hotfix Updates

Some days ago Microsoft released a small security update for Exchange Servers. The original post from Exchange Team. This Update is OPTIONAL so there are some new features available in Exchange OnPremises. See the original Download Links: Update also brings some new features: Some fixed issues: The issue Outlook doesn’t display unread message icon caused …