Sage has made the decision to retire the Microsoft 365 Connector and Office 365 Contacts with the release of Sage 100 2025.0 (currently scheduled for April 2025).
In short, these add-ons allowed you to view select Sage 100 Customer information from within Microsoft Office 365. However, it was not a widely-used feature among customers, so Sage made the decision to retire the product and focus those resources on innovating other areas of the product.
Customers already using the connector can continue to do so. However, after the release of Sage 100 2025, the add-ons will no longer be available for new installation.