I have loaded Outlook 2007 Beta 2 and have hit a snag. When I send an invite
to a meeting, the meeting disappears, no-one gets the invite and I get the
message below:

This message could not be sent. Try sending the message again later, or
contact your network administrator. You do not have sufficient permission to
perform this operation on this object. See the folder contact or your system
administrator. Error is [0x80070005-0x80070005-0x000508].

I also get the following message in my log:

16:41:49 Synchronizer Version 12.0.4017
16:41:49 Synchronizing Mailbox 'Nigel Bernie'
16:41:49 Synchronizing local changes in folder 'Sent Items'
16:41:50 Uploading to server 'brutus.arc.govt'
16:41:50 Error synchronizing message 'test'
16:41:50 [80070005-508-80070005-323]
16:41:50 You do not have sufficient permission to perform this operation
on this object. See the folder contact or your system administrator.
16:41:50 Microsoft Exchange Server Information Store
16:41:50 For more information on this failure, click the URL below:
16:41:50
http://www.microsoft.com/support/pro...8-80070005-323
16:41:50 Moved a message that failed synchronization to 'Local Failures'.
Message subject - 'test'. You can view this message in your offline folder
file only.
16:41:50 Done

When I create an appointment, it stays for 30 secs then disappears and I get
the following logged:

16:10:13 Synchronizer Version 12.0.4017
16:10:13 Synchronizing Mailbox 'Nigel Bernie'
16:10:13 Synchronizing local changes in folder 'Calendar'
16:10:13 Uploading to server 'brutus.arc.govt'
16:10:13 Error synchronizing message 'Desk Time'
16:10:13 [80070005-508-0-1380]
16:10:13 You do not have sufficient permission to perform this operation
on this object. See the folder contact or your system administrator.
16:10:13 Microsoft Exchange Server Information Store
16:10:13 For more information on this failure, click the URL below:
16:10:13
http://www.microsoft.com/support/pro...005-508-0-1380
16:10:13 Moved a message that failed synchronization to 'Local Failures'.
Message subject - 'Desk Time'. You can view this message in your offline
folder file only.
16:10:14 Error synchronizing message 'Prepare Quiz Space'
16:10:14 [80070005-508-80070005-323]
16:10:14 You do not have sufficient permission to perform this operation
on this object. See the folder contact or your system administrator.
16:10:14 Microsoft Exchange Server Information Store
16:10:14 For more information on this failure, click the URL below:
16:10:14
http://www.microsoft.com/support/pro...8-80070005-323
16:10:14 Moved a message that failed synchronization to 'Local Failures'.
Message subject - 'Prepare Quiz Space'. You can view this message in your
offline folder file only.
16:10:14

I have uninstalled Outlook 2003, unistalled Outlook 2007, reinstalled
Outlook 2007, tried renaming the OST, Mapi32, and EMS*32.dll files and
repaired the installation but the same issue appears. I have also tried the
Office Diagnostics.

I can create appointments in the web version on Outlook and they appear and
hold in Outlook 2007.

We use Exchange 2003.

Help please.