Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Send checked roster CSVs and exception lists to the shared folder.
You get a clean CSV from revised Excel rosters, plus a matching list of rows to correct in your shared handoff folder.
Turn incoming workbooks into CSV files for data handoffs.
Get a CSV and row count from the worksheet you choose when your team uploads an Excel file to the handoff folder.