Improve MATCH() function speed

I am using a match() function to compare email addresses, looking for matchs of new emails to old. Old emails are in a data set of approx 40k and new emails total 16k. The process takes more than an hour. How might I improve on this performance? Is MATCH the best function to use?
Thanks
Kevin

Hi Kevin,
Do you need to know where the matching addresses are in the 'old' table, or would knowing whether an address in the 'new' list is matched one or more times in the 'old' list be sufficient?
If the latter, here's a method that may do the job. I've assumed the 'old' table ("Table 1") has the addresses listed in column C, the 'new' table (Table 2) has them in column D, and that there is one header row on each table
Add a column to the right of column D in the 'new' table. It will become Column E.
In E2, enter this formula:
=COUNTIF(Table 1::$C,D)
Copy cell E2, click on the column reference tab for column E to select the while column, then command-click on E1 to remove it from the selection.
Paste.
The formula will be pasted into every cell in Table 2::E.
Calculation time will depend on the number of rows in Table 1 and the number of addresses in Table 2.
Any row with a result in column E of 1 or more contains a duplicate (or more than one duplicate) of the address in the cell to its left. Addresses with zeroes to their right are unduplicated in the 'old' table.
Regards,
Barry

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Message was edited by:
giubat

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