Exchange / Office 365 Integration ← Knowledge Base What are the most common reasons FullContact will not be able to connect to my Office 365 or Exchange account? How can I tell if my Outlook.com account can sync with FullContact? Do FullContact Tags sync with Office 365 / Exchange? What types of Microsoft accounts can sync with FullContact? What versions of Microsoft Exchange Server (on-premises/self-hosted Exchange) does FullContact support? Can I connect my Office 365 / Exchange Online if my account has two-factor authentication enabled? Does Exchange limit the number of contacts I can store? Why does FullContact ask for permission to access my mailbox, sign me in, and read my profile? Are there any photo size limitations in syncing photos between FullContact and Exchange? Why do we ask you for your email address and other information in order to connect Exchange/Office 365? Why do we sometimes ask for your password? Do we store this? If I cannot sync my desktop Outlook contacts to FullContact due to a problem with my Exchange account, are there any other options? Microsoft's terminology: what to know.