In MC Editor Options, if you check on “Exchange Online” option, then 2 fields “Exchange Server” and “Domain” will be blurred.
The difference for selecting “Exchange Online” option can be seen when you open a New Signature window and click User Fields: 2 properties IPPhone and PostOfficeBox are available with Exchange On-Premise, meanwhile they are not available with “Exchange Online” option.
If you already have a signature template that uses Exchange On-Premise, and you select either IPPhone or PostOfficeBox as property of that signature:
And then you change to use Exchange Online, then the template still remains the same but 2 properties IPPhone and PostOfficeBox are not available in the User Fields list anymore:
For the signature to work well after migrating to Exchange Online, you will need to remove the two properties IPPhone and PostOfficeBox from the signature template.
Applies to: MC 3.01.00.0020
Reference: TFS #16020
Knowledge base ID: 0123
Last updated: Feb 24, 2016