Error: The Add-in cannot be loaded by Outlook

ESET Outlook Plugin error when starting Microsoft Outlook

KB Solution ID: SOLN767|Last Revised: May 28, 2010

If you receive the following error message when starting Microsoft Outlook,

The Add-in 'ESET Outlook Plugin' (C:\PROGRA~1\ESET\ESETNO~1\EPLGOU~1.DLL) cannot be loaded and has been disabled by Outlook. If no update is available, please uninstall the Add-in.

please see the information contained in this article.

The error message above may occur on a computer with multiple user profiles after an upgrade, reinstall, or failed uninstall of ESET Smart Security.


Solution 1: Outlook 2003 and 2007 - Delete the extend.dat file

The extend.dat file contains cache for add-ins in Microsoft Outlook which are activated by the Add-in manager. If you delete the extend.dat file and restart Outlook, a new .dat file is automatically created. The new extend.dat file should contain no inconsistencies and should prevent the error from occurring in the future.


To delete the extend.dat file (Windows XP):

1. Exit Outlook
   
2. Click Start → Search → All files and Folders → More advanced options and select the Search hidden files and folders check box
   
3. In the top search field type extend.dat and click Search.
   
4. In the search results section, right-click on the extend.dat file and click Delete.

NOTE: If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Documents and Settings\Username\Local Settings\Application Data\Microsoft\Outlook.

To delete the extend.dat file (Windows Vista):

1. Exit Outlook.
   
2. Click Start and type extend.dat in the bottom search field then click the search icon.
   
3. Click Advanced Search in the upper right corner. Select the Include non-indexed, hidden, and system files (might be slow) check box on the left. On the right, type extend.dat in the Name field and click the Search button.
   
4. In the search results section, right-click on the extend.dat file and click Delete.

NOTE: If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Users\Username\AppData\Local\Microsoft\Outlook

To delete the extend.dat file (Windows 7):

1. Exit Outlook.
   
2. Click Start and type Search in the bottom search field then click the search icon.
   
3. Click Change search options for files and folders.
   
4. Click the View tab and select Show hiden files, folders, and drives. Deselect Hide extensions for known file types and Hide protected operating system files.
   
5. Click Apply and OK.
   
6. Click Start and type extend.dat in the bottom search field then click the search icon.
   
7. In the search results section, right-click on the extend.dat file and click Delete.

NOTE: If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Users\Username\AppData\Local\Microsoft\Outlook

Solution 2: Outlook 2003 only - Install Office 2003 Service Pack 3

If you are using Microsoft Outlook 2003, you can install Office 2003 Service Pack 3 to resolve the error message. Office 2003 Service Pack 3 can be download from Microsoft’s website, here:

http://www.microsoft.com/downloads/details.aspx?FamilyId=E25B7049-3E13-433B-B9D2-5E3C1132F206&displaylang=en

Turn background of desktop icon text transparent

Go to the Control Panel
Go to Performance and Maintenance(category view)
Go to System
Go to the Advanced tab
Go to Performance/Setting
Add check to "Use drop shadow for icon lables on the desktop.

What is RTM, GA, Retail, and OEM?

Short for release to manufacturing, the version of a software product that is given to manufacturers to bundle into future versions of their hardware products. RTM (release to manufacturing) is when the code is completed and signed off. RTM versions are typically released to manufacturers before they are released to the general public so that the manufacturers can work out any bugs the software may encounter with hardware devices. The release of an RTM version does not necessarily mean that the creators have worked out all the problems with the software; there still may be more versions of the product before it is released to the general public.

GA, or general availability, is when that RTM’s code is finally made available to the general public. Even though there are three months between RTM and GA release date, there is no difference between the RTM code and GA version code. The RTM bits are the GA bits. RTM is done with the code, and GA is done with the packaging, distribution, marketing, etc. Ready to sell.

When GA comes, you can get Windows in two flavors:

Retail, which is what you buy at a store, is a less restrictive license (you can transfer it between machines, as long as only one machine is activated at a time), and you are entitled to support from Microsoft.

OEM is a cheaper license, that you get when you get Windows bundled with a PC or if you buy a "system builder" copy. OEM is cheaper because its locked to a system (you cant transfer your license to another machine), and you are not entitled to tech support (the person who built your computer is responsible).

There are two types of OEM: regular and royalty. Regular OEM is what you get when you buy a "system builder" OEM Windows. Except for the label on the disc, regular OEM discs are the same as retail discs, they install the exact same bits as a retail disc. The difference is not in the disc, but in the key; if you activate Windows with a OEM key, the key is forever tied to your system, whereas if you use a retail key to activate, you can move that activation to another computer in the future.

The big PC makers like Dell, HP, and Sony are classified as "royalty OEMs" by Microsoft. They will often customize their disc by including logos, extra drivers, and/or hotfixes. Their discs will also include a special certificate that Windows uses to authenticate your computers BIOS.

Microsoft Help Discovery (MHD)

Microsoft Help Discovery (MHD), organized by Crazu, Chang 2010 (One Man Army) for explore more deeply knowledge basic on Microsoft service and products. As we know that, Microsoft with the brand of latest IT technology products based personal computer system as name as operation system (OS), Windows 95/98/ME/Vista/7/Server and Windows Mobile. All the version shows that the evaluation of the technology had been changed time to time and proven the success of "Microsoft". In here, we started to built a site for all the Microsoft users to knowledge about the news, tutorial, implement of the Microsoft Products! Thank you



From. CrazyU