When you transfer lead ownership, any NEW calls will be defaulted to the new lead owner, but it does not transfer previously scheduled appointments, calls or tasks.
You can transfer appointments, calls and/or tasks one by one through the previous lead owners monthly Agenda (remember to look forward to the next several months as well)
OR
You can transfer these items in bulk
Select the Admin Tab > Transfer
Select the appropriate tab (Appointments, Calls or Tasks)
From the Viewing drop down box on the LEFT side, choose the person from whom the items are being transferred.
From the Viewing drop down box on the RIGHT side, choose the person to whom you are transferring the items.
Click the arrow in the middle of the screen to transfer the selected items.