This sounds very similar to an Exchange 2013 problem that was just corrected in 
CU6, where Exchange would choose DCs in remote AD sites under certain 
circumstances.

Does your Application event 2080 look correct? Are the DCs shown in

"*** Servers  Servers  Servers ***"
                $r = Get-ExchangeServer -Status

                $r | fl Name, Site, ServerRole, AdminDisplayVersion, Static*, 
Current*

The proper ones?

From: [email protected] [mailto:[email protected]] On 
Behalf Of Candee
Sent: Tuesday, September 2, 2014 1:43 PM
To: [email protected]
Subject: [Exchange] Fwd: Exchange 2010 distro list


Hi everyone;

Exchange 2010, SP3, fully patched. The help desk just brought this to my 
attention, and I have done some testing.

Using the EMC, trying to add/remove members from the distribution list 
"members" tab.

If the distro list contains contacts, the members can take 5 or more minutes to 
load the OUs - nothing can be done until they are finished loading.

If the distro list only contains mailboxes, the tab loads almost immediately.

It doesn't matter what OU the contacts are in; whether they're brand new or 
established.

There is nothing in the event viewers; and I can't find anything on the 
interwebs.

Any ideas what else to check?

Thanks!

Candee

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