Microsoft has dragged their feet long enough with the Mac and iPad that I have replaced virtually everything that I used to use in MS Office Professional for Windows with a suitable, (suitable for me) Mac/iOS alternative.
Excel has been replaced by NUMBERS
Word has been replaced by PAGES
PowerPoint has been replaced by KEYNOTE
Outlook has been replaced by MAIL, CALENDAR, OMNIFOCUS or TODO PRO Also on iPad/iPhone by POCKET INFORMANT PRO, also on Mac BUSYCAL 2
Everything I needed to do in Access is now handled by BENTO 4 - Access was a bit overkill, but hey it was there, Bento handles it all, shame though that Filemaker (Apple) discontinued it.
Publisher has ben replaced by PAGES
PROJECT has been replaced by QUICKPLAN PRO (iOS)
All the apps listed above do EVERYTHING that I would have needed to do in MS Office and they all do it well.
In regards to the Outlook replacements I feel that the built in Calendar are sufficient enough. On my Mac BUSYCAL is my main Calendar app, it also has task integration with Apple's Reminders app which I fee is very sub-par for a task app. I do love bothe OMNIFOCUS and TODO PRO CLOUD. Each has unique features that I like. The most Outlook like app though is POCKET INFORMANT PRO, but it is not available for Mac, just on iOS. There is a web version, but has been in beta for years and at one point they were rumored to be working on a Mac version.
If Microsoft were to wake up and make Office for Mac more on par with the Windows version AND release a version for the iPad, I may go ahead and get it, even if it was via Office 365. But at this point it would really have to WOW me into doing so. I've always had Office for Mac on my MacBook, but since the last release and update of iWork have pretty much stopped using Office and use iWork exclusively now.