Ok. Let's try this to get some movement on getting this issue resolved, as there seem to be 10 related active threads. Everybody experiencing this issue:
1. Call Customer Care: 800-922-0204
2. Ask for Tech Support
3. Ask them to open case/ticket for "Integrated Messaging Message+ sync issues on desktop app"
If enough of us call in and open cases/tickets maybe we'll hear something that is being done or at least identified as a 'known issue'.