
Originally Posted by
WTB
when it is sent out to two people at the same time the formula returns complete!
You can account for this by modifying the approach such that:
If the reality is that you have more than 4 columns of each to account for you can revert to a MOD based SUMPRODUCT - if not it's not really worthwhile

Originally Posted by
WTB
The other problem is that if something is sent and then received, and is held before it goes out again it returns complete, when in actual fact it may need to be sent/received a further 3 times, now I guess the only way I can solve this is to predetermine how many times it is going to be sent/received. Which is not ideal as in some cases this will be hard to predict, so I was wondering if anyone had any ideas?
If you don't know this in advance yourself it will obviously prove very difficult for XL to calculate this ... 
In short you will have to stipulate the expected no. of returns in advance - as a general rule of thumb XL isn't great when it comes to guessing.
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