Microsoft | Exchange 2013 update Global Address List Warning messages

Updating Global address list warning messages.
I was running the following command

Update-GlobalAddressList – identity “Default Global Address List”

when I received the following warning messages.
warnings
“WARNING: The Recipient “<domainname>/Microsoft Exchange System objects/OAB version 2″ is invalid and couldn’t be updated.”
This warning occurs in my situation way after the migration of exchange 2007 to exchange 2013. So I am unable to use the old GUI of Exchange 2007. To solve this issue, you need to do the following steps.
Start Adsi Edt (be careful with this change)
Go to default Naming Context > domain name > Microsoft Exchange System objects
adsi-edit-exchange
Open the properties of the objects which gave the warning in the PowerShell message.
properties
Change the mailNickname, you need to remove all spaces
After you removed all the spaces you can re-run the command

Update-GlobalAddressList – identity “Default Global Address List”

After the re-run of the command you will notice you won’t receive any warning messages again

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