Hotfix KB2830145 can't be installed - SID S-1-18-1 and SID S-1-18-2

If you have a Forest and Domain in Windows Server 2003 Level and Migrate to Windows Server 2012 (R2) Level, you may encounter some errors mapping users (Sharepoint or .NET errors).
The crux of the issue is that Windows Server 2012 (and above) introduce two new SIDs. The problem is that Windows 7 and Windows Server 2008 R2 clients do not know about these SIDs (SID S-1-18-1 and SID S-1-18-2) because when they were written these particular SIDs didn’t exist.

The Solution from Microsoft is to install the Patch KB2830145 in all that Servers and Clients. It seems simple, but when you try to install, you might have some errors or the patch can take some days (yes, I said days) to install.

To check if you have this issue on one of the servers, try to use the psgetsid.exe tool (downloaded from https://technet.microsoft.com/en-us/sysinternals/bb897417.aspx)

Exchange Server 2007 Lost - How to Recover Installation and Definitions on a New Server

To end the year smoothly (or not!), I recently had a costumer that lost the Physical Exchange server because a corruption of the disks after a power failure.
The worst fear of any Microsoft Exchange Server administrator is a complete crash of the Exchange server.
First thing to ask.. Backups! Ok, we have backups from the Exchange databases, but not from the Operational System and Exchange Installation.
In this post I'll show how to recover step by step a exchange server (in this case Exchange 2007 with Windows Server 2008. It applies to Exchange 2010 and Windows Server 2003 too) with the following roles: Mailbox, Client Access, Hub Transport, and Management Tools from scratch.