A new, more specific thread, following my original query: http://androidforums.com/threads/af...r-lollipop-contact-phone-numbers-gone.884035/ After updating my Nexus 4 to Lollipop, the phone seems unable to sync contacts with an Exchange server. I have only one Exchange server account, sync'ing Calendar, Contacts and E-mail. The phone reports that all three are synchronising and I receive no error messages. The Calendar and the E-mail appear to be working fine - it is only the Contacts which are not sync'ing. All of the names remained on my phone (perhaps because WhatsApp created a field of its own with a copy of the phone number). However, all details stored on the exchange server, including the Telephone Number fields, have disappeared from all contact names. Creating a new contact either on Exchange or on the phone does not sync to the other. Any suggestions?