We are planning to move from on premise exchange to office365. Some of the mailboxes need to be converted as shared mailboxes. I couldn't see that option for any of the mailboxes. I'm trying to do this thru "mailboxes" in "exchange admin center" using the url https://domain/ecp and I'm logging in using domainname\administrator account.
In EAC, after I click the mailbox on the right side, after "Phone and voice features", I see "In-place archive". The small section "convert to shared mailbox" is missing.
Please help.