FWIW, I’m using an Exchange server and I have this same duplication
issue on a regular basis in my Sent folder. Sometimes even more than two
duplicates. I’ve just gotten used to it. The same duplicates are not
there when I open Outlook or Apple Mail.
Jeffrey W Bullard PhD | FACerS | FWAS
Department of Materials Science and Engineering
Zachry Department of Civil and Environmental Engineering
Texas A&M University
3136 TAMU
College Station, Texas 77843
On 3 Mar 2026, at 8:23, Henry Seiden wrote:
Luis,
I have not experienced the issue on my Outlook account, but it is
infrequently used.
Could this be caused by the settings on your server? IOW, can you see
the same problem using another client (Apple Mail or Outlook Mail or
web app)?
Respectfully,
Henry Seiden
- -
Techworks Pro Co.
E: info<at>techworkspro<dot>com
W: http://techworkspro.com
On 3 Mar 2026, at 8:45, Luís Trevisan wrote:
Hi all,
I'm experiencing duplicate messages in my Sent Items folder in
Microsoft 365 / Exchange account.
Setup details:
- Account type: Exchange / Outlook.com (Microsoft 365 corporate)
- The duplicates appear exclusively in the Sent Items folder
- The duplicate messages are identical
- No other folders are affected
Has anyone experienced this with an Exchange account and found a
reliable fix?
Thank you in advance.
Luís_______________________________________________
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