Mac – how to set the shmmax parameter on mac os x

The email service works fairly well as you can get at it via IMAP, POP, or Webmail. Outlook's IMAP implementation is not as strong as it's Exchange support is.

However, Calendaring is more like an beta product. It is not as stable as the email program, nor feature complete. For example you can't use the Calendar service via a web calendar service, nor via WebDAV. You also can't centrally manage calendar sharing privileges. They are done via the iCal program with the calendar setup on that computer. Apple's Blog and Wiki software have no integration into the Calendar service!

Also, iCal with CalDAV has some major limitations on sending invites to users not in your LDAP Directory; iCal normally let's you invite anyone you can email.

The Entourage team is about to release a version of Entourage 2008 that uses Exchange Web Services instead of WebDAV. (Check mactopia.com and you should be able to find the public preview version). EWS is much more performant than WebDAV or MAPI, and the fact that Apple said that Snow Leopard will support Exchange 2007 (see www.apple.com/macosx/snowleopard/) indicates very strongly that they won't be using MAPI.

Having said that: it's tough to build a fully-featured EWS client. Apple will ship "Exchange support", but what will they support? There are lots of Exchange features (folder access delegation, S/MIME, multiple account support) that Entourage has now that I don't expect Apple to bother with. For that reason, I'd lean towards Entourage, especially given that MS has a "try before you buy" version available for download now and Snow Leopard isn't shipping until some unspecified future date.