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:

Stay connected: 

Update-CASMailbox PowerShell script updated to v1.1

The PowerShell script to set Client Access mailbox settings based on AD group membership has been updated. The issue fixed had been registered as issue #1.  The new release version is ...

13:48 |

Set Mailbox Item Private Flag

Last updated: 2018-01-15 Problem When you migrate messages from alternative email solution (e.g. Lotus Notes) you might migrate sentitive content that must stay private in the new Exchange Server ...

16:01 |

Outlook Download Error 0x80200051

Sometimes you have the need to download the Offline Addressbook (OAB) for the Outlook email client manually. When initiating a manual OAB download you might encounter a 0x80200051 error. A common ...

16:45 |

Reclaiming missing NTFS disk space from VSS

Issue Recently I was facing an issue where Windows Server 2012 R2 reported remaining 22% of free disk space of one of the Exchange Server data volumes. The Exchange Server data volumes ...

12:30 |

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)

 MCT 2017      
MCSA: WIndows Server 2016 MCSE Productivity | 2017 MCSE Cloud Platform | 2017 MCSA Office 365
MCSA Windows Server 2012
MCSE Productivity | 2016  MCSE Cloud Platform and Infrastructure   

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.