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New Exchange 2010 server lag issue

I have Exchange 2010, running on Windows 2008 domain controller.  I added a new windows 2008 server to my network to replace the domain controller. I installed Exchange 2010 on the new server (with the old server still on the network).  Everything replicated, I moved mailboxes, and all seemed good.  I temporarily powered down the old server to make sure that everything was installed and configured correctly on the new server.  **I have not done dc promo yet on old nor have I uninstalled Exchange - this is going to happen when schedule permits)**    In the meantime, new server is running smooth EXCEPT - when users are in Outlook, they click on new email or reply to an email and outlook sits and "thinks" for 30-60 seconds.  Its very annoying to users and with good reason.  I believe that Exchange is looking for the first database (they are both still listed in my Exchange management console since I have not uninstalled the old one yet) and basically waiting for a timeout or something before going to the current database.

How can I quickly resolve this lag until I actually uninstall exchange from the old server? I was trying to find information on maybe making the new database primary or changing the timeout or something but am not having any luck.

Thanks for any suggestions.
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ahyduk1
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ahyduk1
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1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
Start up the old Exchange server.
Exchange expects the other server to be there. Shutting down a server to see if something will break will not work - things will break.
Until you are ready to remove the server you should leave it running.

Installing Exchange on a domain controller is also not recommended. Ideally it should be on a member server. When Exchange is installed on a domain controller it changes the behaviour of Exchange. Exchange will only look to itself for DC functionality.

Simon.
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ahyduk1Author Commented:
Thanks for info, but it really doesn't help with the issue I'm trying to temporarily relieve.

The old server has been off for over a month and everything is working fine (except of course for that lag).  

I know that exchange is not recommended to be on a DC but in this case the company is so small that there is not a budget for an additional physical box.  We are planning on maybe moving to VM's in the near future but not at this time.

As a temporary fix, I found a solution myself.   I turned on cached exchange mode for all users, this removed the lag when hitting the "new email" button.

Thanks.
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ahyduk1Author Commented:
I accepted my own comment as a solution because I found the solution myself. There were no other comments offering any suggestions. I wanted to post my solution in case someone else has this issue in the future.
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