odd icon appearing on outlook email list

an arrow and box appears on outlook email list just in one spot but not attached to any particular email.  see attached picture.  Does anyone know what this is.
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seems a leftover from a drawing, posssibly caused by copying (use of CTRL+C)
toppropsAuthor Commented:
It isn't in an email.  it is on top of list.  not a place you can copy to.
if you want to get rid of it - and it's recent; do a system restore
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toppropsAuthor Commented:
That is a possibility.  I'll try that.  love to know what caused it.  I might try a repair of office before I do the restore.
are you sure it's not malware -or adware?
run mbam and adaware :
So this only happens when Outlook is open?

Temporarily disable any Outlook add-ons (if using MS Office Outlook) or browser plugins (if using Outlook.com) to see whether this may be part of a hidden window or dialog that for some reason is showing.

The following utility will show a list of all windows and dialogs that are open on your computer, including 0x0 pixel and hidden ones, and will allow you to switch to them, show hidden ones, or terminate the windows or the processes creating them.
(Download the 32-bit or 64-bit version as applicable.  Unzip the download to any folder and run winlister.exe.  Options menu > configure it)
This may help you to determine which program and process is creating the fragment on the screen, but it only works up to Windows 8, not 10.

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toppropsAuthor Commented:
Deleting emails got rid of it.  still don't know what it was.  thanks..
toppropsAuthor Commented:
nice utility
Thank you topprops.  That really is a puzzle why deleting emails has cleared the issue, but I'm glad that it has disappeared.
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