I manage all of my clients in an Excel spreadsheet. The data I need to manage cannot be maintained in a single tab. I pull some of the data into the first tab from subsequent tabs via formulas which were then loaded into custom fields for each contact in Constant Contact. The upload from file worked fine with these spreadsheets until you updated your import/upload process. After that happened none of the values in the cells that contained formulas are imported. To work around that process I had to create three new columns and then manually type the values into those cells to match the data populated by the formula in another cell. This is not optimal as that can be error prone which is why I was using formulas in the first place which is a basic feature of Excel. I don't understand why you would change this process on your end which prevents the user from utilizing the most basic Excel features.
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I used to be able to upload my contacts via an Excel spreadsheet including any custom fields. I just realized it stopped updating my custom fields some time ago. I was told to remove my formatting, get rid of my other tabs and to not use formulas in my spreadsheet. What is the purpose of using Excel if I can't use its most basic features. Now I have to do twice the amount of work to support your "improved" contacts functionality. I'm not very happy with this current state of affairs.
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