Ever since I installed Windows Mobile 6.1 on my Q9c I cannot sync between my 2 pcs, both identical with Vista Business...Worked perfectly well with Mobile 6.0..Did master reset, ended partnerships, re-installed everything...still no luck...If I create a new partnership w/ 1pc, the other doesn't work...Computer says Active sync encountered an error on the desktop..Phone says error code 0X86000107