Even I have issue with an account that doesn't be synced.
It's the only account that I am using to test MAPI.
some folders synced for a couple of days, then stopped syncing.
Unfortunately I don't have any exceptions in the MAPI LOG (it's set on Exception Only and it's completely empty)
Gabriele Maoret - Head of SysAdmins at SERSIS
Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)