Unknown error and The operation failed

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Sameer

Member
Outlook version
Outlook 2010 32 bit
Email Account
Exchange Server
Hi All,

I have Office 2010 and when I try to send an email to any email acc it gives me error.

"The operation failed. The messaging interfaces have returned an unknown error.

Any Ideas, please help,

thanks in advance
 

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
since it happens on sending, i would find and rename or delete the SRS file for your profile. Look for it at %appdata%\Microsoft\outlook - paste that line in the address bar of windows explorer to open the folder where it is stored.

Do all addresses fail or just some? A bad address entry in the autocomplete cache can cause errors like this.
 
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