Outlook 2010 adds a "(1)" to Subject line of Send - Microsoft Community


outlook 2010 on windows 10 computers.

i have 2 computers both outlook 2010 , windows 10. messages sent imap account on 1 computer pop3 on other computer result in (1) being added start of subject line. number 1, bracketed, appears on both computers....in sent file of one, , in inbox of other.

any ideas on why may happening?

some third party anti-spam or av utilities add subject line.

the pc using imap mail a/c, start ol holding ctrl key create new msg , send other mail a/c - problem occur?



Office / Outlook / Windows 10 / Office 2010



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