Forum Discussion
Julian12
Jul 08, 2020Brass Contributor
Shared Mailbox disappeared after migration to O365 from EXC2010
Hi,
I'm currently testing the migration of shared mailboxes from an exchange 2010 server to O365 with a hybrid deployment and the exchange online migration wizard.
First I created a user mailbox, converted it to a shared mailbox, synced this account to Office 365 and set up a migration batch for this mailbox only but after successfully completion the mailbox and its user accounts completly disappeared from Office 365.
Any ideas why this happened?
Thanks and regards!
- Spiros KarampinisBrass ContributorJulian12
please make also sure that your on-premises mailboxes are discoverable and configurable through autodiscover process. You may also use the Microsoft connectivity analyzer for that purpose: https://testconnectivity.microsoft.com/- Julian12Brass ContributorHey Guys,
thnaks for your answers!
I checked our server and migrated Users again and recognized that the missing mailbox simply got a new email address whatsoever and hide it's real name between other mail addresses^^
The new primary address isn't even present in the proxyaddresses attribut in the on-prem AD and is even set to another shared mailbox in the AD.
I don't know why this occured, maybe some policies are doing this or the generell Exchange Online service corruption last week was making fun of me.
I will test again, maybe it is working now as expected.
Have a nice week!
Julian12 do you get any output if you run Get-Recipient "your-mailbox" on-prem and in Exchange Online? And what are the user attributes in your on-prem AD for msExchRecipientType and msExchRecipientTypeDetails?
- BemmelenPatrickIron ContributorHi Julian,
Are you still able to see the mailbox in Exchange 2010 when you do a Get-Remotemailbox Powershell command?
And maybe this could be related to your mailbox not being synced because it's account is disabled.
You might want to check out this article:
https://cloudiffic.com/azure-ad-connect-not-synchronizing-shared-and-resource-mailboxes/
This one could also be causing your problem:
https://support.microsoft.com/en-us/help/2710029/shared-mailboxes-are-unexpectedly-converted-to-user-mailboxes-after-di