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Title
Mailboxes added to mailbox or calendar synchronization jobs keep getting meeting acceptance notifications for the already accepted meetings and / or appointments -
Description
Mailboxes added to mailbox or calendar synchronization jobs keep getting meeting acceptance notifications for the already accepted meetings and / or appointments. -
Cause
This happens due to Microsoft Calendar Repairing Assistant sending these notification because it considers these meetings / appointments conflicting. -
Resolution
To resolve the issue, please disable Calendar Repairing Assistant on both source and target till the end of your migration.
For Exchange 2010 on per server basis:
Get-MailboxServer | Set-MailboxServer -CalendarRepairWorkCycle $null -CalendarRepairWorkCycleCheckpoint $null -CalendarRepairSchedule $null
and
Get-mailbox -server <mailbox server> -resultsize Unlimited | Set-Mailbox -CalendarRepairDisabled $true
For Exchange 2010 on per mailbox basis:
Set-Mailbox -Identity <mailbox@yourdomain.com> -CalendarRepairDisabled $true
For Exchange 2013 on per server basis:
Get-MailboxServer | Set-MailboxServer -CalendarRepairWorkCycle $null -CalendarRepairWorkCycleCheckpoint $null -CalendarRepairSchedule $null
or
for all mailboxes on Exchange 2013:
Get-Mailbox -ResultSize unlimited -Filter {CalendarRepairDisabled -eq $false} | Set-Mailbox -CalendarRepairDisabled $true
For Exchange 2013 on per mailbox basis:
Set-Mailbox -Identity <mailbox@yourdomain.com> -CalendarRepairDisabled $true
For all Office 365 mailboxes:Use PowerShell to create a remote session to Office 365 to execute the following commands:$cred= Get-Credential$o365= New-PsSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $cred -AllowRedirection -Authentication BasicImport-PsSession $o365 –Prefix o365Get-o365Mailbox -ResultSize unlimited | Set-o365Mailbox -CalendarRepairDisabled $trueThe Calendar Assistant is now disabled for all mailboxes in the Office 365 tenant. It can be enabled again after migration has been completed by using this PowerShell command:Get-o365Mailbox -ResultSize unlimited | Set-o365Mailbox -CalendarRepairDisabled $false -
Additional Information
For more information on the Calendar Repair, please refer to https://technet.microsoft.com/en-us/library/ee424432(v=exchg.141).aspx. This article is about Exchange 2010, but the functionality is the same for later versions of Exchange and Exchange Online as well.