So much ignorance to a platform that has EARNED its keep by those that do NOT understand it.
To the op
1. No BlackBerry Desktop Manager (BBDM, or BDM for short) is NOT available for IOS in any version - and doubtful because of the plethora of API's required for it to run.
2. What Desktop Manager Allows you to do with your BB.
- Complete Backup of the units Software core db's or even applications and data within and settings. Think of old-school PIM devices like Palm where backup & restore is CRITICAL for Business users. Even with iOS 5 Beta 4/5 with iCloud enabled (to which I'm testing) restoring is HORRIBLY slow and limited even over a 54Gb dual-band WLAN network that is uncongested. Also I can specifically ...
RESTORE: SMS, MMS, Call Logs, Emails (old - since BES activation restores 1000 or 7-days of emails whichever comes first), Contacts, Calendar, Notes, Tasks, Icon Arrangement - it took Apple 4 YEARS to get this EVEN with iTunes desktop client YIKES (I'm talking automated not manual manipulation and automatic is NOT intuitive currently without iOS5 Beta), Alarm, AutoText (think Keyboard "Shortcuts" in iOS5 Beta - trust me you'll LOVE THIS if you bang out FULL EMAILS), Pictures, Video, picture app settings.
Completely Load the Firmware or OS of the BlackBerry - RIM is the FIRST and for a VERY VERY LONG TIME until iPhone the ONLY manufacturer that supports firmware upgarde and downgrades done by the end-user that is available and supplied to the carriers (effectively by RIM) WITHOUT voiding your warranty on model versions (BB5/6 on 9700, BB6 iterations on 9780; regardless of carrier) for BB's in multiple versions.
BlackBerry Desktop Manager 2.1 is available for Mac OS X Leopard, Snow Leopard and Lion (Leopard for 2.0 I think).
Desktop Manager is CRITICAL for migrations for same models due to user hardware/firmware or water damage issues to migrate to a new device.
They build the keyboards for CORPORATE users - and many consumers in nations that pride communications over assets (ownership of THINGS or clout) more than us in the western world.
There is a level of power for shortcuts that accomplishes things so incredibly quickly that even IOS cannot do. Yes in IOS5 Beta you can FINALLY "FLAG" emails - I live by this day in/day out for managing so many service desk tickets for Level 1/2/3 support and field service at headquarters. Although I can properly view tickets as a traverse through the floors and in-between resolving issues (beyond a simple call), on the iPhone vs the BlackBerry - I just cannot be as efficient on IOS yet, notice I said YET>
At my employer we support iPads and iPhones (in limited regions) but BlackBerry is still king. NO corporation can survive without powerful email management - this is 2011 not 2001.
iPhone will get us there but not with the current technology.
PS: Google BlackBerry Shortcuts - and also go into the phone click on the Menu key (BB logo key) and select > Options. Disable "Dial from Home Screen". Trust me you'll realize why so many BB users don't bother play games on their iPhone, can deal with mediocre applications [Poynt, Twitter, Yelp, FaceBook, and the standard social apps] are all the same regardless of platform] and just simply: Call, SMS/MMS, Email, Task, and get ***** done. That's it other than BBM.