Remove the Store and Yammer app from the app launcher in Office 365

Last year Microsoft made the decision to activate Yammer on every new and existing tenant by default to encourage using it. Not everyone is happy with this and therefor I will describe how you can manage this from an admin’s point of view. Also many companies want to disable the access to the Office 365 store and remove the app that goes with it. Continue reading “Remove the Store and Yammer app from the app launcher in Office 365”

Troubleshoot and solve Outlook performance issues

When users migrated to Office 365 complain about performance it’s mostly because they are using many shared mailboxes and calendars or have a big personal mailbox (5GB+). However, with some simple tricks you can increase performance quite a bit for them. Continue reading “Troubleshoot and solve Outlook performance issues”

Fix Office 365 Room Mailbox permission issues

Mostly after assigning permissions for a Room Mailbox in Office 365 the permissions are not correctly synchronized to Outlook clients. I created cases at Microsoft for this “bug” but it seems a fix for this annoying issue is still far away. However instead of waiting for days (or eternity) there is something you can do to fix this within minutes! Continue reading “Fix Office 365 Room Mailbox permission issues”

Prevent headaches by upgrading to the new OneDrive for Business next generation sync client

Recently, Microsoft switched over their default OneDrive for Business to the new OneDrive sync client. It was already possible to run it but was still in a beta phase. In the last couple of months, I did some extended testing and even did a rollout recently for a big company. I can honestly say the improvements are significant, especially in stability.

Continue reading “Prevent headaches by upgrading to the new OneDrive for Business next generation sync client”

Preprovision hundreds of OneDrives at the same time

If you want to roll out OneDrive For Business into your organization and you also want to make life easy for the users you can bulk preprovision the OneDrives. Luckily there is a way to retrieve all Office 365 users and with some Excel/Notepad++  tricks you can list them in a txt file and preprovision 200 OneDrives at the same time (you can do this multiple times). Continue reading “Preprovision hundreds of OneDrives at the same time”

Bulk assign custom Office 365 licenses via Powershell

I came up to create this easy script (with a little bit of help) because I wanted to bulk assign users an E3 license but without assigning Exchange Online functionality. The scripts I found on the internet were way to complex or just not working.

You can have several reasons why you do not want to assign every part of the license to a user. In my case mailboxes for this customer would not be migrated to Office 365 for the next months and therefor I don’t want Office 365 to create a mailbox for these users. Continue reading “Bulk assign custom Office 365 licenses via Powershell”

Secure OWA headers for Exchange Server

Secure Webmail headers in Exchange

If you go to and fill in your OWA URL you will see that default some specific information is showed regarding to your internal Exchange organization. This includes your internal server name, IIS version used and the ASP.NET part. This is information you’d rather hide for the outside world. Continue reading “Secure OWA headers for Exchange Server”

Configure a Hybrid Exchange 2013 environment with Oauth

Since there are already a lot of howto’s on the web on how to build a hybrid setup for Exchange 2013, I came across this alternative way to configure this whole thing with Oauth.

The problem I had and many others with me is that after configuring the Hybrid setup (manual or with the HCW) free/busy lookups were not working or maybe only working in a one way direction. Even after working with Microsoft Escalation Engineers for several days on what seems as such a small issue I needed a fast way to make this working. Microsoft recommended Oauth. Here is briefly how it works: Continue reading “Configure a Hybrid Exchange 2013 environment with Oauth”