Default mail client warning

Could you clarify the context- what prompts this? E.g. clicking on a eml file, on an email link, or is apparently at random?

I have screen OCR'd the text for you so it is now something you and responders can search for:

Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.

These results may be of interest:
https://answers.microsoft.com/en-us/msoffice/forum/all/either-there-is-no-default-mail-client-or-the/aba95463-e552-4560-8e1b-d2058ba6aa40

[SOLVED] Either there is no default mail client or the current mail client cannot fulfill

Fix: Outlook Error Message "Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client." - TeckLyfe

See if you can identify the scenario relevant to you.

What do you see here?


If the message relates to accessing a file type check here:

What version of Outlook/Office ? This error has brought back memories from a bygone era.

glad you found a way forward.