Problem:
user is importing entries to the translation memory from Excel file and is surprised that even though the Excel file contains a lot of rows then he sees not as much entries in the TM.
Answer:
It could be that the imported Excel contains a lot of duplicates which are skipped during import.
In order to check if this is the case one should follow steps mentioned here:
http://www.excel-easy.com/examples/find-duplicates.html