One of my users has 14,694 contacts in his account. His account is set up on the executive assistance's outlook and he has an iPhone and an iPad. sometimes the EA adds new contacts and he is not able to see them in mobile devices. another example is when he adds note to a contact and EA is not able to see in outlook.
anyone has a solution with syncing with multiple devices in office 365??
This is a known issue with apple devices, They add attributes to the created object whatever it is. Mostly seen in meetings. It is a known issue from a long time, and seems it cannot be fixed. Try to create contacts in OWA, or do them as Server side contact, this should help.
Also, if you are not using Outlook for iOS, please try it.
That's right, this syncing app should be installed on a Windows computer with Outlook. Detailed requirements and installation steps are available on the download page.
Looks like I also had outlook on the same iPhone syncing with iOS mail app. which removed and solved the issue.