Outlook 2007 meeting request error

[Israel]

When I send a meeting request out to a number of attendees, I getting the
following error message:

This message could not be sent. Try sending the message again
later, or contact your network administrator. Error is
[0x80070057-00000000-00000000]

Everytime I try, I receive the same error.
Some of the attendees are within the company, other are external attendees ,
I have never had problems sending meeting requests to them in the past.
I was using Office 2003 when there was any problem, now I have Outlook 2007
and I'm receiving this error.
I'm typing the addresses, and selecting from GAL the attendees.

Thanks in advance for your help.

Israel Gonzalez.

 

[Evolution]

I found a possible fix for this. This could be caused by Outlook operating
in "cache Exchange mode". Try this:

Go to Tools and then Email Accounts
Edit the existing account
If you're on Exchange, click the "More Settings..." button at the buttom of
the window
Save changes and exit Outlook.
Remove the *.ost file (I would rename it by putting .old at the end so that
you don't lose it)
Reopen Outlook

You should now be able to send the meeting request just fine.

Good Luck!