1. Search for your Contact open their Contact Card

2. Click the Contact Card Tab to edit the contact
3. Select Merge with Duplicate from the Status drop-down

4. Select which contact you would like to merge with
5. Refine Merge Options
6. Read the Warning message and Select I Agree & Proceed if happy to proceed to merge the duplicates.

Q: Will the Categories on both contact merge into one?
A: Yes the categories that are attached to the two contacts will update/merged into the one single contact record.
Q: Will the Tasks for each contact merge?
A: Yes the tasks that are attached to the two contacts will appear against the one single contact record.
Q: Will the Activity Schedules for each contact merge?
A: Yes the Activity Schedules that are attached to the two contacts will appear against the one single contact record.