Thanks for the links. The MS article re. increasing timeout length was very useful and seemed to be the answer as the mouse is now working as expected. Thanks for taking the time to suggest the resource.
My older (2012/2013) Dell BT Travel Mouse has stopped working on my Windows 7 Pro Inspiron 7110 machine and is not listed under Mice and Other Pointing Devices in the Device Manager.  Both the Intel Centrino Wireless Bluetooth 3.0 Adapter and the Microsoft Bluetooth Enumerator are listed under Bluetooth Radios and working properly. When I click on Bluetooth Devices and go to Add a Device there is nothing showing until I click the power on the underside of the mouse and press the Discover button. Then Add a Device displays a Dell BT Travel Mouse Bluetooth Mouse image, but grayed out. Allowing discovery to continue, I get a message "Connecting to device" but eventually after 2 or 3 minutes I get a message that "It took too long to add this device" and "Try adding the device again." which simply loops me back. Any ideas what's going on here?  tks...
Dell BT Travel Mouse MIA