When I try to send meeting requests I am finding that the first account that my phone attempts to send from is NOT the address I have set as the default address. This has started happening recently and I have not made any changes to the device. Is there anything I can do, aside from getting rid of the extra email account that keeps acting like it were the default?

When I send Meeting Requests from my 8320 it actually allows me to chose the account I want to use. I believe it will default to the last-used e-mail account for the contact(s) that you chose to invite. But mine allows me to change it right there using the Send Meeting Request Using parameter:

You should be able to change it before you send the meeting request. There is a "send meeting request using" field when you add the invites.

Yup, I've had this problem ever since I got my Curve. If you "email all attendees" you can choose the FROM email on the actual email being sent out, but the secondary email will stay on the appointment and any subsequent updates will be sent to and from the secondary email. Therefore, I just don't use the "invite attendees" option on my Curve.

The workaround is to go into your Service book and delete all CICAL entries except the one for the account you want to send out the meeting invite from. I have this issue on a 8100. I also have a really wierd one that RIM support is working on where every meeting I send out has the totally incorrect date and time no matter what it says on my blackberry. My blackberry is using BIS on ATT and has v4.3.1.96 on it. It's really strange. Please don't respond telling me to take the battery out or wipe and reset my blackberry because I've done all that including spending 2.5 hours on the phone with RIM.