has anyone experienced any issues with iphones that are running iOS version 
4? it also appears that this version of software is also creating a 
performance impact on the exchange server?

http://support.apple.com/kb/TS3398 

On Fri, 2 Jul 2010 09:24:46 -0700, "sawyer" <occompguy@cox.net> wrote:

>has anyone experienced any issues with iphones that are running iOS version 
>4? it also appears that this version of software is also creating a 
>performance impact on the exchange server?
>
>http://support.apple.com/kb/TS3398 

You betcha:

http://msexchangeteam.com/archive/2010/06/30/455342.aspx
---
Rich Matheisen
MCSE+I, Exchange MVP