Office mail merges are extremely slow after upgrade to Exchange 2013

Question

Ever since we migrated from Exchange 2007 to 2013 SP1, our employees have reported that mail merges are taking triple the amount of time to send messages. What used to take an hour is now 3 to 4 hours. Some offices are required to send upwards of 6,000
messages at a time. I know Exchange 2013 handles throttling differently than previous versions however the default (global) ThrottlingPolicy was sufficient with our previous 2007 installation. I've never had to deal much with Throttling so I'm not exactly
sure of what settings I should be looking at....also I'm not sure if this would even be related to throttling. Has anyone experienced this issue before with Exchange 2013 and could you provide any recommendations or settings that I need to be focusing on in
relation to Outlook client connections? We are currently using the GlobalThottlingPolicy for all users.

Answer 1

Hi,
What’s the version of Office?
The following Outlook client versions are fully supported by Exchange server 2013.
Outlook 2013
Outlook 2010 SP1 with November 2012 Cumulative Update ( available from
http://support.microsoft.com/kb/2687623 )
Outlook 2007 SP3 with November 2012 Cumulative Update ( available from
https://support.microsoft.com/en-us/kb/2687404 )
I suggest to upgrade one office client to Outlook 2013 (with word 2013) to check this issue.
Best Regards.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Lynn-Li
TechNet Community Support