Interface Not Registered

When using Word as your e-mail editor you might encounter the error “Interface Not Registered” when trying to send your e-mail. As a result you are unable to send it but you are able to send e-mail when setting Outlook as your e-mail editor. To solve this so you are able to use Word as your e-mail editor close all running Office applications. Then use Start-> Run and type;

Regsvr32.exe %Windir%\System32\Ole32.dll

This will correctly register the ole32.dll file in the registry.


Reading Pane not available in Drafts folder

For some strange reason there the Reading Pane is not available for the Drafts folder in Outlook 2003. If you really need to have a Reading Pane in the Drafts folder you can create a Search Folder to workaround the issue.

Create a Search Folder for the Drafts folder

  1. File-> New-> Search Folder
  2. Select “Create a custom Search Folder” which is at the bottom of the list
  3. Press “Choose”
  4. Give the folder a name e.g. “Drafts”
  5. Press “Browse…”
  6. Deselect the root folder and make sure only the “Drafts” folder is selected
  7. Press OK to return to the “Custom Search Folder” dialog
  8. Press OK and press Yes again to close the notification

You now have created a Draft folder for which you can enable the Reading Pane!

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Create a BCC rule

While you can create a rule to automatically CC someone when sending a message, unfortunately an automatic BCC is not possible. However, this is often preferred over a CC and still possible via a VBA macro solution or via an add-in.

Continue reading: Create a BCC rule

CRC (Cyclic Redundancy Check) errors on pst-file

CRC (Cyclic Redundancy Check) errors are indicating errors with a specific file and in lot of cases with your hard disk. It doesn't indicate a problem with Outlook itself but a problem with the place on the hard disk where your pst-file is located. When this occurs after you have just copied the pst-file (on disk, from network, from CD, by download) you should first verify that the original source still works and try to copy it again. If this has happened "all of a sudden" like in that it still worked yesterday, the issue can be either software based or hardware based. Continue reading: CRC (Cyclic Redundancy Check) errors on pst-file

Cannot delete a message

When trying to delete a message, it could be that Outlook refuses this and shows an error message. Most common error messages are;

“An unknown error has occurred.”


“Messaging interface has caused an unknown error.”

There are 4 easy methods which you can use to solve this for most situations.

Continue reading: Cannot delete a message

Creating a Classic View in Outlook 2003

Since a lot of people are “hooked” on the classic view of Outlook or simply don’t like the initial Outlook 2003 view I made an overview of settings to change so it looks more like previous versions of Outlook.

Change the Messages view

The Messages view is the default view for all Mail Folders. When we change this view all Mail Folders who are still in this default Messages view will change as well.

To change the Messages view go to;
View-> Arrange By-> Current View-> Define Views…-> select Messages-> button Modify-> button Other Settings…

There are 3 changes we’re going to make to this default view;

  1. Change the location of the Reading Pane to Bottom
  2. Ungroup the items
  3. Remove lines between messages

View Other Settings Although the method isn’t fail proof and it won’t change the view of the folder who are in a modified view already this will still save you a lot of time adjusting the folders. For the folders which didn’t change after you modified the Messages view there is no other way than to repeat the steps described above in that specific folder.

Drag down the Navigation Pane

This one is easy; go to the top of the Navigation Pane hold down the mouse and then drag it down

Starting Outlook in the Folder List or Shortcuts Navigation

By default Outlook starts in the Mail Navigation. This navigation only displays the Mail folders. The Folder List Navigation shows all folders that exist in the mailbox in a hierarchy. The Shortcuts Navigation can be compared to what the Outlook Bar was; here you can configure all your own shortcuts to other Outlook folders, Explorer folders or even files*
Outlook remembers in what Navigation you closed but you can also change this in the registry. This can be handy if you are an administrator and want to deploy Outlook in the Folder List or Shortcuts Navigation so you can give your users a “Classic” Navigation.

To change the start-up Navigation we must change/create a registry key.;

  1. Make sure Outlook is closed.
  2. Open your registry editor by opening the Run command and type regedit (regedt32 for Windows 2000)
  3. Locate the following key
  4. Expand the Options key and select the “WunderBar” key.
    If it doesn’t exist yet choose  Edit-> New-> Key and name it WunderBar (case sensitive!).
  5. In WunderBar select “BootModule”
    If it doesn’t exist yet choose  Edit-> New-> DWORD value and name it BootModule (case sensitive!).
  6. Double-click on the newly created value and give it the number matching the Navigation you want to start Outlook with;
    0: Mail Navigation
    5: Folder List Navigation
    6: Shortcuts Navigation; note that you must have a shortcut present to the Inbox in order for this to work
  7. Press OK on the input box and close the registry editor
  8. When you open Outlook the Outlook will start in the configured Navigation.

Not comfortable editing the registry manually? Download the reg-files here. Double-click one to import them into the registry and change the Navigation.

*When you drag & drop files or folders from Explorer into the Shortcuts Navigation a shortcut will be created automatically

Unblock Attachments

Unblock Attachments buttonBelieve it or not but some people are actually creating and sending messages with attachments that will do your computer no good. Yes, you are correct; VIRUSES! There are a lot of file types in which a virus can reside. The most known are executables (programs) and scripts (automated processes).

A filename consists out of 2 parts; a name and an extension. The extension is the part of the filename after the dot. For instance the filename document.docx. Document is the name part and docx is the extension part. The last part decides how the file opens. In our example a docx file will open with Microsoft Word.

Continue reading: Unblock Attachments

Microsoft Outlook Backup Add-in not available

Personal Folders Backup Add-in buttonThe Personal Folders Backup add-in creates backup copies of your .PST files at regular intervals making it easy to keep all of your Outlook folders safely backed up.

Although the download site states that it only works with Outlook 2002, 2003 and 2007, it can actually be made compatible with Outlook 2010 as well with a Registry.

Unfortunately it can’t be made compatible anymore with Outlook 2013 and Outlook 2016. However, for these versions, alternatives are available as well.

Continue reading: Microsoft Outlook Backup Add-in not available