Exchange Hybrid - Migration error for some users : MapiExceptionNamedPropsQuotaExceeded

Question

Hi all,

everything is in the title, I'm migrating our mailboxes to M365, we are in a hybrid scenario with Exchange 2016/Exchange Online.

95% of our users are ok, but for 5 % batch migration is failing in the middle of the sync (sync start and run then fail) and I have the following error :

Error: QuotaExceededException: Cannot get ID from name. --> MapiExceptionNamedPropsQuotaExceeded: Unable to get IDs from property names.

I checked all around quotas On prem, mailboxes are good for Exchange online quotas.

I migrated concerned mailboxes to a new db tocheck if it could be related to a corrupt db same issue.

If someone can help troubleshooting this, thanks in advance.

Best regards

Answer 1

This is an old issue that used to plague Exchange 2007 and 2010:
https://learn.microsoft.com/en-us/previous-versions/office/exchange-server-2007/bb851493(v=exchg.80)?redirectedfrom=MSDN

Are you using some third party software that is updating messages with x headers or custom properties?

I would open a case with 365 support and ask for guidance on how to handle.

Answer 2

Hi,
Thanks for the answer,
Yes I spotted this KB but thought I wasn't concerned as we are in 2013 CU 23, and just some users are concerned.
I already open a case with 365 support, but no useful answer so far.

Regarding your question, there is a plugin that is archiving mails to a folder ina file server but I don't know if it set a xHeader or other property.
Thanks for the help,
Best regards

Answer 3

Hi, I tried the 2007 workaround with no luck. Error is on Exchange Online NamedProperties limitation, it seems that my concerned mailboxes exceed the 30 000 Named Properties. Ho can I count/decrease/delete/remove some Named Properties for a particular mailbox ?

I tried to see Named properties with the following $Mailbox = Get-Mailbox -Identity "john.doe@ssss .com" $MailboxItems = (Get-MailboxFolderStatistics -Identity $Mailbox.Identity -FolderScope "All").Items $NamedProperties = (Get-ItemProperty -Path $MailboxItems).NamedProperties | Measure-Object

but the NamedProperties is empty...

These 7 mailboxes are stucking our migration.... and support case we opened didn't help.... Actually the support guy asked me to remove a user from the failed batch and to test his mailbox only... It fails with a "primary mailbox already exist" error message and the support guy is focusing on it instead of our original issue.... I managed to workaround the primary mailbox issue, and the migration fail again with same message

Error: QuotaExceededException: Cannot get ID from name. --> MapiExceptionNamedPropsQuotaExceeded: Unable to get IDs from property names.

Any help will be appreciated. Thanks in advance, Best regards