Hi Sami,    Contact TAC and they will be able to give you a fix using a Powershell script which will delete the VoiceMessages root folder from EWS. The above link posted is a good explanantion of what is happening. ... View more

Thanks for this. I managed to get this same response from TAC on third go. I was given a script which can do it for a list because it is effecting almost all of our migrated accounts. Is the MS change going to be reported somewhere? Can I monitor it? Cheers ... View more

Did any body find a solution for this? We are experiencing the same issues. Single Inbox over O365: User receives message in Outlook. If the read delete the message, MWI is not updated and the message is not removed from their Unity Mailbox. If the user listen the Voicemail via the voicemail IVR all works fine. This issue started for shortly after upgrading to 11.5 ... View more