Keep the systems you already use.
Working in the isolated pilot is distinct from general availability. No provider is connected to the public demo.
The isolated pilot uses the official Xero Demo Company and a fictional Sage Business Cloud Accounting test company to verify accounting workflows. This does not imply general release or support for real accounting accounts in the public demo.
The Sage pilot connection is read-only. It can bring authorised customers, suppliers, invoices, payments and bills into Kintreo, then reconcile source-confirmed changes. Kintreo does not create or edit Sage records.
Gmail can surface authorised messages for review. Google Calendar can read events and create one confirmed follow-up without duplicating it. Both have been tested with a dedicated fictional Google account.
A software name is not a live connection.
Sage Business Cloud Accounting and Sage 50 are different products. The isolated Sage tests described here cover Business Cloud Accounting, not Sage 50. QuickBooks, Sage 50, Invoice Simple and Supercrew are not offered as live public connections.
The registration form also asks about other tools to understand demand. That is not a promise of integration. Your existing tools stay in place.