Exchange PST Import Error – ‘Couldn’t connect to the target mailbox’

KB ID 0000801


I was trying to import some PST files into SBS 2011, and got the following error;

Couldn’t connect to target mailbox

Couldn’t connect to the target mailbox


Before you proceed, make sure the user you are logged in as, and are attempting to perform the New-MainboxImportRequest command has been granted the rights to carry out mailbox imports, read the following article;

Exchange 2010 (Post SP1) Bulk Importing Mail From pst Files

Note: If the machine you are importing into is part of a CAS array you may also see this error, to fix that problem you need to create a temporary mail database and move the target mailbox into it, then change the RpcCLientAccessServer property for that database, like so;

set-MailboxDatabase TEMPDB -RpcClientAccessServer

1. Make sure the folder you are importing from (this has to be a UNC path NOT a path to local folder!) has permissions granted to it for the Trusted Exchange Subsystem group.

Trusted Exchange Subsystem Group

2. If your machine is also a global catalog server, (Note: As mine is an SBS server, and the only DC I don’t really have a choice.) You may find that the ‘Microsoft Exchange RPC Client Access’ service is not running, start it manually then attempt the import again.

Microsoft Exchange RPC Client Access service


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Author: Migrated

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