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How can we stop the bottleneck on our Exchange 2003 server

As part of our migration from SBS 2003 to SBS 2011 we had to replicate the Public Folders from the source to the destination server.  We done this two days ago and we noticed that our emails are delayed whether they are internal or external with some emails taking two hours to be sent.

Today we installed a new hard drive and moved the Badmail, Pickup and Queue folders to  folder on this new drive but this hasn't helped as the emails are still taking ages to arrive and our Public folders haven't updated in the past two days.

We then dismounted the Public store and ran isinteg and eseutil /d against the database but the emails are still queing up.

Can anyone advise how we can solve this issue as it is causing huge problems ?

Many thanks in advance  User generated image
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Viral Rathod
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Please check "Messages awaiting directory lookup" queue and letus know which e-mails are stuck in the queue

Is this users e-mails or any Public folder replication are stuck on the queue.
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Hi Viralrathod,

Thanks for the post.

It is about 99% Public Folder replication emails.  There are a few other emails but they eventually make their way into the users mailbox after a bit of a delay.
Exchange 2003 server is not able to find the way to reach Exchange 2010 server,you need to basically cross check the Exchange 2003 Routing Group and SMTP connector and make sure exchange 2003 can reach the Exchange 2010 server.
Thanks again.

Do you know how I would do this ?
I should have said that I know how to check that the Exchange 2003 server can see the Exchange 2010 server as it can ping it etc but what do I need to check on the routing group ?

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I wasn't able to find a proper fix