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             This Article Applies to: 
			This article applies to all Excel® versions since 
			Excel®
			97. 
			Excel® 2007, the latest edition released by Microsoft, is 
			compatible with most existing Add-Ins, but will display a completely 
			different interface, so it has a special section on it.Most of this article will also apply to other Microsoft® Office® 
			applications like Word® or PowerPoint®, but they usually have much 
			less Add-Ins available than Excel®.
  
			
			What are Add-Ins? 
			An Excel AddIn is an extension to Excel and, once installed, will 
			load every time Excel is loaded, becoming “part” of Excel until it 
			is deliberately uninstalled. They often add entries to existing 
			menus of even whole menus or toolbars. Add-Ins can also supply 
			additional functions that can be used in cell formulas like the 
			native ones. They have been part of Excel for long and, in fact, 
			Microsoft supplies several Add-Ins with Excel itself, with the most 
			well known being the “Analysis Toolpak” and the “Solver”. 
			 
			Many Add-Ins are also supplied by Third Party software makers, 
			either to extend Excel native functionality, providing additional 
			functions and features, or to link Excel to data applications, 
			common on corporate networks were Business analysts use Excel to 
			manipulate data from corporate databases like ERPs, Accounting, 
			Business Intelligence suits or other operational systems.
			Add-Ins usually have the file extensions .XLA or .XLL. For 
			samples, try searching for “Excel Add-Ins” on any internet search 
			engine. You will find hundreds of them. 
			 How to Install / Uninstall Excel Add-Ins? 
			Excel® 2007 
			Excel 2007 Add-Ins are managed from the “Excel 
			Options” button on the “Office Menu” 
			menu: 
			
			  
			Select "Add-Ins" on the left side navigation 
			column. Excel will list all available Add-Ins on the right pane 
			window. On the bottom, select Manage: Excel Add-Ins 
			and click "Go". 
			
			  
			From here, follow the guidelines below on "All Excel 
			Versions" as this will be common to all. 
			
			Excel® 97 to 2003 
			Excel Add-Ins are managed from the “Add-Ins” entry on the “Tools” 
			menu: 
			
			  
			All Excel® Versions 
			The above menu entries (depending on version)
			will both open a Pop-Up windows where you can activate / 
			deactivate any AddIn Excel is currently aware of by checking / unchecking its respective checkbox: 
			
			  
			Click Cancel to leave the Add-Ins as they were when the 
			Pop-up opened, discarding any changes, or OK to activate the 
			selections made. Activated Add-Ins will be loaded after OK 
			and every time Excel is loaded after that, until selections 
			are changed again. 
			How to add new Add-Ins to the Add-Ins Available list? 
			This article will ignore the “Automation” button, as it is used for 
			more technically complex Add-Ins.
  There are two ways to add new AddIns to the list: 
			
				
					- Saving them to the default Add-Ins folder
 
					- Telling Excel where they are using the “Browse” button.
 
				 
				1) Saving them to the default Add-Ins folder: 
			 
			Excel has, by default, an Add-Ins folder and all Add-Ins saved on 
			it will automatically be listed on the pop-up list. This is 
			the easiest way to do it, but you need to know there the 
			folder is located on your hard disk.  
			Excel will tell you where it is. Click on the “Browse” 
			button and you will get the regular “file open” dialog box, open by 
			default on the Add-Ins folder: 
			
			  
			Open the whole disk path (as on the picture above) to find it. 
			Once you know where it is, open it using the Windows Explorer and 
			save your new Add-In file there. 
			After you have copied the Add-In file there, close Excel and open 
			it again. Open the Add-Ins window and your file will be there (you 
			will need to know its list name; the file supplier should tell you 
			that). 
			
				2) Telling Excel where they are using the “Browse” 
				button. 
			 
			Instead of finding the default folder and copying the file there, 
			you may instead tell Excel that there is an Add-In somewhere else on 
			the harddisk (or even on a network disk). Click on the “Browse” 
			button, select the folder where the file is located and select it.
			Click “OK” and the file will be immediately added 
			to the list.  
			
			  
			Activating ALL Add-Ins: Why not? 
			
			You should not activate all Add-Ins just because they are present 
			and ready to be activated. Add-Ins take time to load and, the more 
			you activate, the longer Excel will take to load. Leave frequent 
			used Add-Ins activated so they are loaded every time, but activate 
			less frequent ones only when necessary, deactivating them again when 
			they are no longer needed. 
			  
            
                                
                  
             
             
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