[Exchange] Mail enabling of public folders don't check, if the address is used somewhere else

[bogdankruszewski]

Describe the bug
If you try to mail-enable a public folder with Exchange (in my case 2016), there is no check, if the given e-mail address is used somewhere else. There is only a cryptic error message shown.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Public Folders'
2. Click on a public folder and try to mail enabled this public folder with an e-mail address, which already exists in a "Contact" for example
3. See error

Expected behavior
In this case it should be checked, if the given e-mail address is used somewhere else and an error message like "This e-mail address is already used in a ... (contact, mailbox, distribution list, or whatever)" should be shown, instead of the cryptic error message from an .net exception.

SolidCP Info

• SolidCP Version: 1.4.9 and previous