Mar 19th, 2010
by Christian.
When you have configured Exchange 2007 / Outlook 2007 to use the Autodiscover functionality (autodiscover.xml), you have probably seen this window many times:

“Allow this website to configure user@company.com server settings?
https://server-or-domain/autodiscover/autodiscover.xml
Your account was redirected to this website for settings.
You should only allow settings from sources you know and trust.”
Feb 24th, 2010
by Christian.
Since a week, all of a sudden, I had this very strange problem that I could not move email items from the message list pane to a directory in the left pane. I got this error:
“Can’t copy the items. An OLE registration error occurred. The program is not correctly installed. Run Setup again for the program”
Nov 30th, 2008
by Christian.
When you try to uninstall Office 2003, the following error may occur
This patch package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer patch package.
I faced this error yesterday, after a failed upgrade to Office 2007. My computer hang at the point “uninstalling office 2003“.
Mar 2nd, 2008
by Christian.
If you work with Outlook 2007 in combination with Exchange, you might get the following error when trying to open a shared calendar:
“The messaging interface has returned an unknown error. If the problem persists, restart outlook“
To open the shared calendar anyway, you have to close and re-open Outlook. It will now work again (for a short while).