Combining 2 workbooks into 1 worksheet based on common row value I have two workbooks, one with Email and IP values and the 2nd one with Name and IP Value.
I'm trying to combine these two workbooks into one and to fit the names and emails to common IP's. 
Screenshot: http://take.ms/0Y3wv
Example:
Workbook 1 has:
jack123@gmail.com 1.1.1.1
emilly444@gmail.com 2.2.2.2

Workbook 2 has:
John 12.12.12.12
Jack 1.1.1.1
Emily 2.2.2.2

The result should be:
(Discard John cause we don't have his IP in the 2nd workbook).
jack123@gmail.com 1.1.1.1 Jack
emilly444@gmail.com 2.2.2.2 Emily


This is yet another job for the Vlookup function.
First, something that could be done to make your life easier (personal experience) is to put the common column of data in "A" column position of Workbook 2.
If you want the output (with both data from Workbook 1 and 2) be output to Workbook 1, just use Vlookup:
 On column 3 (row 2) of workbook 1 (assuming your data is organized as in your example, and that, on Workbook 2, your column A has 1.1.1.1):
=Vlookup($B2,'Workbook2'!$A$1:$B$3,2,False) 

Then drag the formula down to all the rows that have data.
What this code does:
1: $B2 will select the identifier in the Workbook 1
2: 'Workbook2'!$A$1:$B$3 will select the range where the data will be looked up (here you should just click on the workbook you want and select the data, than click "," and click back on the Workbook 1). Also, I used fixed references ($) so you could drag down the formula.
3: 2 is the column from which the function will retrieve the data.
4: False is just for an exact match.
You could do this for more columns of data, just pay attention to the identifier and to which column you are getting the data from.
For the data that is missing, you could write an if function in VBA to delete the row if a certain cell is #N/A (which will be the result you get, if you use the vlookup).

A simple INDEX MATCH formula will do what you want,
=INDEX(Sheet2!A:B,MATCH(B1,Sheet2!B:B,0),1)

This formula gets the required data from Sheet2. Now I leave the rest for you to google and find out how to get the data from a different workbook. Thats an easy task and a minute change to the formula. Let me know if you face any difficulty.