I have seen many people asking a very common question in forums and restricted news groups, “Is there any support available for Outlook 2007 clients to access Exchange 2010 online archive?” Answer to this was no but now Yes. It is available now.
Exchange team announced the support yesterday and the December 2010 cumulative update for Office 2007 family will add this feature in Outlook 2007 now.
The update can be downloaded from: Office 2007 Cumulative Update for December 2010
I am sure everyone knows the limitation but thought of reminding one more time. You need Exchange 2010 Enterprise CALs to avail the online archive mailbox feature. So it is very clear that if you are running exchange 2010 standard CALs.