Is anyone familiar with the issue posted at iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update?

My company's Exchange hosting service broadcast a notice about this patch. I'm using a pwnagetool-JB'd iOS4 on a 3GS (old iboot, old bb, AT&T), and am wondering if it is safe to apply.

The service notice read as follows, if anyone is curious:

Shortly after the release of Apple’s new iPhone 4, reports surfaced about poor ActiveSync performance. Apple has released a patch to correct this issue and we strongly encourage users to apply it. The patch applies to all iPhone 4 devices and iPhone 3G and 3GS devices updated with the iOS4 operating system software.

Failure to apply this patch may result in ActiveSync errors, including failure to synchronize e-mail, calendars, and contacts. Install instructions and additional information can be found on Apple’s support site, iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update. A reboot of the device is required after installation and users may need to reconfigure ring tones and some personal settings.

Originally Posted by Vigilante

Is anyone familiar with the issue posted at iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update?

My company's Exchange hosting service broadcast a notice about this patch. I'm using a pwnagetool-JB'd iOS4 on a 3GS (old iboot, old bb, AT&T), and am wondering if it is safe to apply.

The service notice read as follows, if anyone is curious:

Yes it is safe to apply. This is a bug in iOS 4 that really needs a permanent fix.