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Generally, you can take a look at help.outlook.com/.../dd125429.aspx about how to connect Exchange online mailbox via iPhone.
Please note, for some iOS version , the contact synchronization is not enable by default.
Thanks, Neo Zhu
Do you means you lost the contacts of other Excahnge email accounts? iPhone use active sync to get all the information from Exchagne online mailbox. That means if the contacts is not at Exchange online mailbox, it will not exist in your iPhone Exchange online email contacts.
For the issue you mentioned, you can check again the contact of the old Exchange account on Outlook client . If it exist , you can import it to your iPhone again.
How are you doing? I am just writing to see if there is any progress on this issue. I do not mean to push you. I just want to ensure that you do not encounter any problems during the troubleshooting. Thank you.
Still no luck. I have a Microsoft Exchange account through the office and my PC at home is a regular Outlook email account. It's the Outlook contacts that I can't back on to my iPhone. They were always there before the transition to Office 365.
How are you? I'm writing in just want to ensure that all the information above is useful for you.