The calendar plugin is an essentual part of our Confluence usage. Since it has been depreciated (and we have upgraded to Confluence 4.0) we have lost this function. Whilst I accept that it was our decision to upgrade, it wouldn't be long before Atlassian started to recommend this upgrade.
You can now get this lost functionality back by PURCHASING team calendars. Doesn't this go against one of Atlassians 5 values - "Dont **** the customer"? We feel throughly ****ed as you've just added $1100/year to our Atlassian bill to maintain what we already had. We're may or may not want all the lovelies that come with the new Team Calendars, but that should be our decission.