Backup jobs in Veeam Backup for Microsoft Office 365 fail with the following error:
[Timestamp] 14 (5696) No folder hierarchy changes
[Timestamp] 14 (5696) Preparing folders for items processing...
[Timestamp] 14 (5696) Error: Invalid Exchange Server version
[Timestamp] 14 (5696) Stack:
[Timestamp] 14 (5696) at Veeam.Ews.ExServices.GetExchangeServerVersion()
at Veeam.Archiver.Source.MailboxActivator.PrepareFolders(IMailboxContext bind, ExFolder top, ExcludedFolders excluded, CancellationToken cancel)
at Veeam.Archiver.Source.MailboxActivator.DoMailboxWork(CancellationToken cancel)
at Veeam.Archiver.Source.MailboxAction.DoWork(CancellationToken cancel)
[Timestamp] 14 (5696) Mailbox processing failed: firstname.lastname@example.org
This is a known issue in Veeam Backup for Microsoft Office 365 version 188.8.131.522.
Click here to download an update to resolve this issue.
Please be aware that starting from September 2018 downloading updates will require an active contract for the corresponding product.