BES 5.0 SP2 MR4 was just released ... and only 1 thing fixed; heh.

In a Microsoft Exchange 2010 environment with a lot of activity, the BlackBerry Enterprise Server might take
longer than expected to send email messages to the device. (DT 1006793)

For more information about how to improve BlackBerry Enterprise Server performance, see the Managing the
BlackBerry Enterprise Server Performance in a Microsoft Exchange 2010 Environment Technical Note.
...

So I just saw this KB article; neat point of information:

The maximum permitted record space for each BlackBerry smartphone user is 4850 KB in the BlackBerry Configuration Database and the average space required by each BlackBerry smartphone user is 400KB. A typical entry in the MsAddresses table in the BlackBerry Configuration Database is approximately 300 bytes in size. The MsAddresses table contains two copies of the contact list so that the BlackBerry smartphone user accounts...

Let's face it ... we can't ignore the iPhone ... and neither can Microsoft: Official comments from Microsoft on the Exchange Team Blog regarding the problems with iOS 4 and Exchange ActiveSync.

Okay, admittedly, this is not a BlackBerry-related post, but it is useful for Exchange engineers all the same.

iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update

It seems that Apple's recent release of iOS4 and the "revolutionary" iPhone 4 has caused a "small" problem for enterprises running Exchange. In essence, the...

I read a great article on bink.nu that talks about using a swee GUI tool to manage certificates with Exchange 2007. Definitely a must read for any Exchange Admins out there