My name is Thomas Stensitzki and I work in IT since the good ole' days of Windows NT 3.51. My overall career in IT started in school with Pascal on CP/M. After programming in Basic on C64 and in Amiga Basic on Amiga 1000 I moved to "the real" stuff and partnered with friends to start a regional internet provider company, HKN, in Duisburg.

Since May 2014 I am the owner and principal of Granikos GmbH & Co. KG which provides enterprise consulting services for Microsoft Exchange, Office 365, Azure and Cloud Security.


After starting as a software programmer for .NET (classic ASP.NET, SharePoint and even Dynamics CRM) I switched to the infrastructure side of things and focussed on SharePoint and Exchange. After some time I had to make a decision to either take the red pill or the blue pill. Exchange Server won (guess the color of the pill) and I made my way up to Microsoft Certified Master for Exchange Server 2010.


I do hold various Microsoft certifications which support my knowledge of the Microsoft enterprise technology stack and help me to provide a reliable consulting service. In addition I help implementing the Enow Management Suite since 2010. The solution helps you to monitor and report on your Exchange, Exchange Online, SharePoint, Skype for Business (aka Lync) and Active Directory environments.

My blog is available here:


If you want to contact me, just sent me an email:

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Create a new Room Mailbox with Security Groups

Description This scripts creates a new room mailbox and security two groups for full mailbox access and and for send-as delegation. The security groups are created using a configurable naming ...

11:38 |

Enabling Kerberos Authentication Fails with Exchange Server

There are quite a lot of good step-by-step manuals available describing how to enable Kerberos authentication for Exchange Server 2013/2016. The following issue has been seen in an Exchange 2013 ...

09:00 |

Email Delivery Fails For Other Office 365 Tenant

This blog post focusses on an issue where your Exchange Online users are not able to send emails to other Exchange Online recipients outside of your organization when using a 3rd Party ...

11:43 |

Establish compliant OOF settings

Problem Out-of-Office (OOF) messages have to follow the compliance rules as regular email communication. This is not necessarily a known fact to end users. If a company does have a strict ...

16:00 |

Set external OOF settings based on AD group membership

Description This script sets the mailbox ExternalOofOptions to 'External' for members of a given security group. ExternalOofOptions for users that are NOT a member of the security group ...

15:55 |

Remove Out-Of-Office rules from user mailbox

Description This script searches for OOF rules created by users using the Outlook rule-tab in the OOF assistant and deletes exisiting OOF rules. In preparation to configure compliant Out-Of-Office ...

15:55 |

Geschwingkeit ist keine Hexerei

Website Boosting Magazine
November 2010
Site Optimizing: Wie lernende Algorithmen Ihrer Webseite Beine machen
Website Boosting Magazine
February 2011
 Website-Boosting: Geschäfte in Nullkommanichts
Website-Boosting: Geschäfte in Nullkommanichts
Webstandards Magazin
March 2011
White Paper Beschleunigung von SharePoint Sever 2010
White Paper
January 20, 2011

Microsoft Certified Trainer (MCT)
Microsoft Certified Solutions Expert: Server Infrastructure (MCSE)
Microsoft Certified Solutions Master: Messaging (MCSM)
Microsoft Certified Master: Exchange Server 2010 (MCM)

MCSA: WIndows Server 2016 MCSE Productivity MCSE Cloud Platform and Infrastructure MCSA Office 365
MCSA Windows Server 2012

Angaben gemäß § 5 TMG:

Thomas Stensitzki
Parkhofstrasse 19A
41836 Hückelhoven

Thomas Stensitzki


Telefon: +49 2433 95247 80

Verantwortlich für den Inhalt nach § 55 Abs. 2 RStV

Thomas Stensitzki
Parkhofstrasse 19A
D-41836 Hückelhoven

Gemäß § 28 BDSG wird jeglicher kommerziellen Verwendung und Weitergabe der Daten widersprochen.