Exchange 2019 CU12 has been released to the Microsoft Volume Licensing Center and the public Microsoft Download site! Exchange 2019 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously. CUs are a complete installation of Exchange 2019 and can be used to install a fresh server or to upd… Read the rest “Exchange 2019 CU12 Released”
Exchange 2016 CU23 has been released to the Microsoft download centre! Exchange 2016 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously. CUs are a complete installation of Exchange 2016 and can be used to install a fresh server or to update a previously installed one. Exchange 2013 h… Read the rest “Exchange 2016 CU23 Released”
Working with a customer’s security team, it was noted that some messages were set to SCL –1 and this was not initially expected. We were paying particular attention to the SCL value as work was being done to clean up old EOP configuration that was bypassing protection.
When deploying an Exchange Hybrid configuration, one of the most critical components to publish externally is the Autodiscover service. Autodiscover enables seamless client connectivity and hybrid functionality between on-premises Exchange and Exchange Online, including mailbox moves, free/busy lookups, and Outlook profile configuration. However, publishing Autodiscover to the Internet can become … Read the rest “Exchange Autodiscover Publishing Blocked By L7 Load Balancer”
Below are a series of links to the main Microsoft Defender for Office 365 blog. Shortcuts added here as this is one of my shared bookmarks.
Note that some links have KQL queries and IOCs related to that specific attack.
12-July-2022
Planning to deploy Office 365 and integrate with your on-premises Exchange infrastructure? Great! While running the Exchange Hybrid Configuration Wizard (HCW) will be one of the highlights it should be a boring and uneventful portion of the project. That will be true if all of the required planning, remediation and preparation was done. If not you’ll be finding out about those issues pretty so… Read the rest “Microsoft Teams Source IP Address Used Connecting to On-Premises Exchange”
Rather than kicking it old school and using the classic tools such as AD Users & Computers (dsa.msc) to move FSMO roles, PowerShell makes it nice and easy to get this done rapidly.
In this example we are moving the roles gracefully, but there is also the -Force option.
To start with, let's confirm where the FSMO roles currently reside:
Note that server DC-1.wingtiptoys.ca… Read the rest “Move FSMO Roles Using PowerShell”
When deploying or migrating Microsoft Exchange Server, one critical yet often overlooked component is the Alternate Service Account (ASA). The ASA is used by Exchange to support Kerberos authentication for services such as Outlook Anywhere and MAPI over HTTP, providing a secure and efficient alternative to NTLM. Without a properly configured ASA, Exchange falls back to NTLM. NTLM is an older prot… Read the rest “ASA OOPS – What Happens When It Is Overlooked”
Install the Microsoft Defender for Identity (MDI) sensor onto a newly built DC? Easy you say, and that should only take 5 minutes. Well, if that was the case there would be no need for this post, and as my Dad would say, there is no such thing as a 5 minute job.
The below is a brand new Windows Server 2019 DC. It was built, fully patched and then promoted. Next up is to install the standard Mi… Read the rest “MDI Install Error 0x80070643 Windows Server 2019”
When discussing network configuration for Office 365, there will be a series of issues and challenges that need to be addressed. Ideally this is all done in a proactive manner, with the final items addressed in the POC phase.
One of the cornerstone issues is around how access to and from Office 365 will be managed. This has to address end user access from workstations and publishing your on-premi… Read the rest “The Way Things Were–EOP IP Ranges October 2018”