I'm in the early stages of migrating our users to exchange 2010 environment. Our exchange 2010 have rollup2 installed.
One of our issues is that users using Outlook web app (mailbox in exchange 2010) can't view any shared calendars of users mailboxes still in exchange 2003. The shared calendars come up blank/empty of any events. These calendars are visible when using outlook 2003,2007, and 2010 clients. If the users in exchange 2003 are moved to exchange 2010 all is fine.
any suggestions or things I need to investigate?