IOS 4.1 + 4.2.1 Exchange 2007 (with SP2) Calendar Sync Issues

I had noticed several issues with my calendar and it's (in)ability to sync correctly with my company Exchange Server (2007 SP2) (with OWA support and ActiveSync on, running and verified using https://www.testexchangeconnectivity.com)
OBSERVATIONS/FAULTS
1) Over a period of time, I noticed appointments accepted from others or created myself on Webmail/Entourage 2008/Outlook 2010 in VMWare on the same Exchange server were not appearing on the iPhone
2) Invites accepted on iPhone did appear in webmail + clients
3) After iOS 4.2.1 update from iOS 4.1 (iPhone 4 is only 1 month old), issues got worse
4) Did a complete restore to iOS 4.1 and clean install. Exchange would connect 100% of the time, Mail and Contacts sync without fault. Calendar would not sync at all. At the time of account reconnection, there were 4 invites unanswered in my Mail Inbox which immediately got picked up by the iPhone, but all existing invites/appointments did not appear
5) Repeated Step 4, but going back to iOS 4.2.1 (I'm a sucker for the latest software for my sins, but don't believe this is wholly related).
FIX
How I "fixed" this (and by fixed I mean I can get all my appointments now)
1) Under Settings > Mail, etc.
2) Under Calendars (bottom of settings window), switched off Time Zone Support (note, Exchange server is in the same time zone as I am in). Also set Sync option to sync all, not just 2 weeks (and yes I did have invites newer than 2 weeks in my Exchange calendar)
3) Voila! It picked the invites up.
4) I've since set the calendar to sync only 1 month back as I don't need all the old invites on my iPhone
QUESTIONS
Do the Apple Support Team have any ideas why this would happen and why this fix seemed to work for me?
If anyone else is suffering this, maybe try the above and see if it helps, I'd be interested to know as this might help IT departments everywhere

I was so glad to get multiple Exchange account support with iOS 4. I have been synching with my work account (calendar, mail) and with my Google accounts (calendar, mail, contacts). After upgrading to iOS 4.1 three days ago, my Google accounts appear to be working fine but my work account refuses to connect to the Exchange server for calendar or mail.
My company forced a passcode when I originally added the account. For troubleshooting I removed the account and recreated it. The account verifies but never requires that I have a passcode. I then removed all of my Exchange accounts, restarted my phone and recreated my company Exchange account. Again, verifies without requiring a passcode, and neither my calendar nor my mail will connect - zero events, zero emails. My mail even proudly says it updated and shows the current time/date stamp - but nothing. When I upgraded to 4.02, I had to set up a passcode. I am highly suspicious that because 4.1 is not synching properly because it is not handshaking correctly regarding the security on the Exchange Server ... that is my guess. And I echo, IT NEEDS FIXED! I am screwed not being able to get my emails and calendar events on-the-fly.

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