Using Adsiedit to Add or Remove E-mail Aliases on On-Premises Active Directory – Office 365

If you are synchronising your Office 365 account with your on-premises exchange/Active Directory, you will know that you cannot edit exchange user properties using the Office 365 administrator portal.
If you try, you will come across this error or a similar one:

The operation on mailbox “X” failed because it’s out of the current user’s write scope. The action ‘Set-Mailbox’, ‘EmailAddresses’, can’t be performed on the object ‘X’ because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization.

The reason for this is due to the fact that the AD and O365 are synchronised. Office 365 knows this and does not allow you to make any changes on O365 if there is a corresponding attribute that links up with your Active Directory.

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Using Adsiedit to Increase User Mailbox Size Beyond 2GB on Exchange Server 2003

If you use Exchange 2003 (I’m not sure if the same applies to later versions), you may have noticed that you cannot set a user’s mailbox size to anything greater than 2097151KB (2GB).

The good news is that this limit is only GUI imposed (soft limit) and not a hard value fixed on the exchange server software it self (hard limit).

Increasing a user’s mailbox is really easy and safe – however, I don’t recommend that you configure the size to some unreasonable or extreme limit.
As always, a full backup of the mail store is recommended before changing any settings on the Exchange.

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