So we deal with two different problems here.
Looks like error 80040803-30141506-0-533 is a limit of how many open folders the Grommunio server can handle at the same time for one client.
There's something similar (similar error message) here
I've applied said workarounds to see whether it will resolve my issue.
The thing is that in my own case (I have a lot of those errors), I open four mailboxes, one shared mailbox and two public folders, so that could indeed apply to me.
The exchange limit seems to be 500 open handles per client. Looks like the default in grommunio is the same, set via variable emsmdb_max_obh_per_session
I'll report back if the above workaround did solve the issue. If not, I'll try to increase the emsmdb_max_obh_per_session
setting, since I have a particuler usecase here.
As for error 80040102-501-80040102-430, I'm still wondering what happens. I see that error quite often, and usually that's the one after which I have to recreate the profile in order to have offline sync work again.
Do you guys get that specific sync error too ?