What is the difference between setting up account as 'Exchange' vs. (Perhaps if I knew more I could accomplish the second option via the 'Other' category.) On the iOS devices I was offered a choice to set the account up as either Exchange or. While re-adding my Outlook account to the 3 devices I noticed a difference. I thought it had fixed the problem, but it's back. Last month I attempted to resolve this problem by removing the account from all three devices and then re-added them. While testing just now I found that a single instance of a recurring appointment deleted on my Macĭid synch to the other 2 devices. On either my iPhone or iPad are not synching with the other 2 devices. Lately, changes to recurring appointments Everything has worked fine until recently. I use the standard Apple email and calendar clients for all three. I use an email account associated with my Office365 subscription on a Mac, iPad, and iPhone.