Mac sync error is generally caused due to an outsized of outlook Mac cache memory. So, you need to clear it if you wish to eliminate outlook for Mac sync error. Due to the immense recognition of outlook, lots of users request to use outlook on Mac devices. As a result, Microsoft soon released outlook for Mac. Like MS outlook for windows, users can share calendars, notes, send or receive emails on outlook for Mac too. However, some users faces outlook for Mac sync issue while updating OST and PST files. If you also encounter this error, then grab Outlook Customer Service to make connection with deft technicians.