I would like to know where I can get some information about to configure OWA 5.5 with Exchange 2000. I read here
that it is possible, but I didn't read anything about how to do it.
BTW: I want to use OWA 5.5 and not 2000 because I have Exchange 2000 Std., which doesn't support OWA as front-end in a front-end/back-end configuration.
It's true -- you can use OWA 5.5 against an Exchange 2000 computer. This is documented in a couple places, including Microsoft Knowledge Base article Q260832. There really isn't much to configure either -- however, there are some caveats.
First, you'll need to install a new Exchange 5.5 SP4 server in your Exchange 2000 site. If you've already converted your Exchange organization to native mode, you won't be able to do this. If you're still in mixed mode, the Exchange 5.5/OWA server will join the Exchange organization. Then users can point to the OWA interface and, once authenticated, their Exchange 2000 mailboxes will be exposed.
Keep in mind that OWA 5.5 uses MAPI and could cause bottlenecks. OWA 2000 no longer uses MAPI and can scale much better. Also keep in mind that you don't need an FE/BE configuration in order to use OWA. OWA is installed by default on all Exchange 2000 computers. So if all you need is OWA 2000, then you already have it. Users can simply point their Web browsers to their existing Exchange 2000 server and use all of the new OWA 2000 functionality.
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