"No default mail client" when trying to copy emails to UR

[URExplorer]

Hi,

When trying to copy emails from Outlook to a folder in UR that I used for previous Outlook emails, there's now a popup that

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

I checked, and it's already set. So I unset it, then re-set it, then tried the copy again. Same result.

I'm working with Ultra Recall Pro 6.2.