Outlook 2010 (+ Exchange 2013) works extremely slow

We have a user that works with Outlook 2010 (on a RDS Server) that is connected with cache to Exchange 2013. The response of Outlook is extremely slow and we think because this user has a 15Gb mailbox. However, he refuses to delete any mail for various
reasons. Is there any way to speed up Outlook? The rest of the system works fine, it's just the email.

Hi,
By "connected with cache to Exchange 2013", do you mean the user is using Cached Exchange mode? If not, please help the user switch to Cached Exchange mode to check the result. If the user has any shared folders, also cache those folders to check if it helps.
If we try to start Outlook in safe mode, will this issue persists? To open Outlook in safe mode, press Windows key + R to open the Run box, type
outlook.exe /safe and press Enter. If performance improves, check again to make sure that you disabled any Outlook add-ins that may affect performance.
In addition, please click File tab > Info > section Mailbox Cleanup and check your Exchange Quota information. We can also try to close Outlook,
rename the OST file, and then reopen Outlook to re-create the OST file.
For more troubleshooting steps about slow Outlook performance issue, please refer:
http://support.microsoft.com/kb/2441551/en-us
Hope this helps.
Best Regards,
Steve Fan
TechNet Community Support

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