Hi,

I have system that has just completed a public folder migration from SBS 2008 to Exchange 2013. The migration was a success and everything works and is accessible. Users are reporting bad slowness while using these folders now its been moved, slower than the previous system.

A run-down of the system/things I have thought of:

The folders are accessed from a 2008 R2 RDS server running Outlook 2013. 

The entire public folder store is approx 350GB in size.

Exchange and RDS servers are virtual machines with more than enough resources and not under load at any point.

The servers VHD's and exchange data are stored on a single P2000 SAS SAN directly connected to hosts. (raid 10)

There is no Anti virus on the servers to possibly hinder this.

Accessing normal exchange mail works at a good speed. (mail store approx 200GB)

All windows updates for exchange/server/office have been installed.

Dos anyone have any suggestions to improve the performance here?

Thanks Robbie

this article is related new public folder limitation and architecture

https://technet.microsoft.com/en-us/library/dn594582%28v=exchg.150%29.aspx

Thanks for this link.

After reading this the public folders in question fall within the listed limits. 

Hi,

According to your description, I recommend run ExBPA to examines the Exchange Server deployment and determines whether the configuration is set according to Microsoft best practices. Please refer to Beta of Microsoft Office 365 Best Practices Analyzer for Exchange Server 2013 now available.

Besides, run Get-PublicFolderStatistics and Get-PublicFolderItemStatistics <Identity> to check the statistic of public folder statistic, more details please see:
https://social.technet.microsoft.com/Forums/office/en-US/c18441e3-528d-4722-be71-6fa468866a7b/exchange-2010-virtualization-maiboxes-great-performance-exchange-2010-virtualization-?forum=exchange2010

Thanks