Exchange HCW8078 - Migration Endpoint could not be created

While migrating a customer from Exchange 2010 to Exchange 2016, I had to create an Exchange Hybrid Deployment, because the customer wants to use Microsoft Teams. Nothing fancy and I’ve did this a couple of times. Unfortunantely the Hybrid Connection Wizard failed to create the migration endpoint. A quick check of the logs showed this error: Microsoft.Exchange.MailboxReplicationService.MRSRemotePermanentException: The Mailbox Replication Service could not connect to the remote server because the certificate is invalid.

Moving a small on-prem environment to Azure/ O365 – Part 2

A couple of days ago, I wrote about our first steps to move our on-prem stuff to Azure. This post will cover how we adopted Office 365 and how we have started with our Azure deployment. Our first step into Office 365 was Microsoft Teams. We needed a solution for calls (audio/ video) and chat. We skipped Skype 4 Business and started with Microsoft Teams. Our Microsoft Teams deployment was pretty simple: We used our Microsoft IUR Office 365 E3 plans.

Exchange Control Panel /ecp broken after certificate replacement

As part of an ongoing Exchange 2010 to 2016 migration, I had to replace the self-signed certificate with a certificate from the customers PKI. Everything went fine, the customer had a suitable template, we’ve added the necessary hostnames and bound IIS and SMTP to the certificate. The mess started with an iisreset /noforce… The iisreset took longer than expected. After that, I tried to login into the ECP, entered username and password and got an error.

Moving a small on-prem environment to Azure/ O365 - Part 1

It was a bit quiet here due to the current COVID 19 pandemic. But now I’m back with a pretty interesting story on how my colleagues and I moved most of our on-prem server stuff to Microsoft Azure and Office 365. It all started with the COVID19 lockdown in Germany in March 2020. We moved into our home offices after setting up a small VMware Horizon View deployment to access our PCs using physical View Agents and manual desktop pools.

Access to on-premise hosted Public Folders using Exchange Online mailboxes

Public Folders are still a thing. And while companies are moving their stuff into the cloud, Public Folders still need to be accessed by cloud-located mailboxes. Allowing the access from Exchange Online mailboxes to on-premise hosted Public Folders is well documented by Microsoft, but there are also some fuzz. I had to deal with this during a Office 365 transition project at one of my customers. The background The customer is running a single Exchange 2016 server in a Windows Server 2012 R2 forest.

Office365/ Exchange OAuth errors after replacing TLS certificate

A customer of mine asked for help to analyse a weird OAuth error. They are using a Microsoft Dynamics 365 Outlook plugin, which came up with an error: "Can't connect to Exchange" In addition to this, they also faced an issueaccessing shared calendars of Exchange Online mailboxes. Clearly an OAuth error. So we ran the Hybrid Connection Wizard again, which finished without any errors. But the errors persisted. Next stop: OAuth configuration.

Once in a year: How to update TLS certificates on ADFS server and proxies

You might got this news some days ago: Starting with September 1, 2020, browsers and devices from Apple, Google, and Mozilla will show errors for new TLS certificates that have a lifespan greater than 398 days. Due to this move from Apple, Google and Mozilla, you have to deal with the replacement of certificates much more often. And we all know: Replacing certificates can be a real PITA! Replacing TLS certificates used for ADFS and Office 365 can be a challenging task, and this blog post will cover the neccessary steps.

Passed Microsoft exam AZ-103 - Azure Administrator Associate

Six weeks ago, I passed the Microsoft AZ-103 exam and earned the Azure Administrator Associate. A last minute pass, because AZ-104 was already launched. But better late than never. I had to re-schedule the exam a couple of times because the test center was closed due to COVID19. Patrick Terlisten/ Creative Commons CC0 The Azure Administrator Associate is a Administrator-role certification and it is all about implementing, managing and monitoring the Azure identity, governance, storage, compute, and virtual network solutions.

Missing Microsoft Teams calendar tab with on-premise Exchange

Microsoft Teams got a big push due to the current COVID19 crisis and many of my customers deployed it in the past weeks. At ML Network, we are using Microsoft Teams for more than a year, and we don’t want to miss it anymore. We are running Exchange 2016 on-premises, currently CU16. We were missing the calendar tab in Teams since we started with Microsoft Teams. when you do some research about this issue, you will find many threads and blog posts, but these are the two key facts:

Connecting to Exchange Online with PowerShell

The task was simple: Change the alias and the primary SMTP address of a Microsoft Teams team. This can be done by changing the alias and the SMTP address of the underlaying Office 365 group. But how? All you need is a PowerShell connection to Exchange Online. Patrick Terlisten/ Creative Commons CC0 All you need is a PowerShell on your local computer and Office 365 credentials with the necessary privileges.