From: sawyer on
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

From: Rich Matheisen [MVP] on
On Fri, 2 Jul 2010 09:24:46 -0700, "sawyer" <occompguy(a)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