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Address book issues

I’ve lost access to everyone on the global address list – how do I get this back?

We’re currently working to implement a bespoke technical solution to give Exchange Online users access to the global address list. In the meantime, you can find people's email addresses on Lookup, the University’s email and telephone listing service:

My display name has changed in Exchange Online's address list – how do I change it?

Go to your profile on and update your Display Name:

  1. Go to
  2. Click Your page.
  3. Click the Edit button.
  4. Edit your Display Name.
  5. Click the Save button.

How do I export my address book out of Thunderbird?

In Thunderbird,

  1. Switch to the address book view.
  2. ToolsExport...
  3. Select vCard for export format.
  4. Enter a file name and folder.
  5. Export.

The .vcf file created can be converted to an Exchange Online format .csv file using the Hermes migration tool at as described in How to migrate your Hermes Address Book to Exchange Online.