We have issues only since upgrading from 8451 to 8538. We subsequently upgraded to 8545 today to try to resolve below. Issue we are are seeing is Inbox does not show/download any email in the inbox (root folder only, sub folders inside the inbox appear to be ok). We have raised support ticket and they advised 8545 would resolve it but sadly not fixed the issue as yet.
This appears to be effecting only a couple of large mailboxes.
This applies to Outlook 365 using exchange (mapi)
We are seeing sync errors such as: (note: xxx.xxx.com is our server address redacted)
16:25:19 Synchronizing server changes in folder 'Inbox'
16:25:19 Downloading from server 'https://xxx.xxx
16:25:20 SyncMonitor triggered for Inbox (0x80004005)
16:25:20 Error synchronizing folder
16:25:20 The client operation failed.
16:25:20 Microsoft Exchange Information Store
16:25:20 For more information on this failure, click the URL below:
16:25:27 Synchronizing local changes in folder 'Inbox'
16:25:34 1 view(s)/form(s) updated in online folder
16:25:36 SyncMonitor triggered for Inbox (0x80004005)
16:25:36 1 view(s)/form(s) updated in offline folder
16:25:36 Error synchronizing folder
16:25:36 The client operation failed.
16:25:36 Microsoft Exchange Information Store
16:25:36 For more information on this failure, click the URL below: