If you are updating existing accounts using NeonCRM account IDs, it's a good idea to create a saved report that allows you to see what those accounts look like after the batch update is complete. It's pretty easy to do this by creating a 'comma' column beside your account ID column and copy/pasting the combined two columns into the 'in range of' operator for account ID in an All Accounts Report. This will be illustrated below:
Place a "Comma" column next to your "Account ID" column, copy the data from both columns (don't copy the headers, 'AccountID' or 'Comma').
Go to the Reports tab > New Report > All Accounts Report and edit the criteria. Under the Basic search category, select Account ID.
From the dropdown menu, choose the "In Range Of" operator. Paste in the contents from your Excel sheet - but be sure to delete the last comma that was pasted in, as not to cause an error.
From the results page, you'll have the option to save the report configuration. The resulting saved report will give you a "snapshot" of the batch updated accounts so you can view them after you complete your update.