Why haven’t all my contacts from my file been imported?

Your Excel contains more than 65,600 contacts and not all contacts have been imported during the process. The reason for this is because Excel 2003 and all previous versions have a limit on the number of rows in your file. The maximum is 65,536 rows. If you want to import more contacts, you can do this by importing a different file format, such as a CVS of a TXT file. Or you could split the file into two files.