contact folders

I have an Excel spreadsheet containing information that I use to create Outlook contacts using VBA. My VBA creates all the contacts correctly. However, when I need to update the contacts because the data changes or I need to make other changes to the VBA, some contacts are recreated rather than...

[single computer, single user - Windows 10, Outlook 2010, no add'l devices so no syncing needed, no mobile version, etc.] I have two .psts files - both POP3 First one was original and has everything, even more than one contact folder. Second .pst created years later to deal with email for...