"move" command doesn't work in case of files on network

Question

I setup a theWatchFolder fold on network as Watch Folder. This works like when the folder on network gets a file, I'm notified via email and the file should move from watch folder (which is on network) to theDestinationFolder (which is also on another network). I used "move" command for that but it copies the files from the theWatchFolder to theDestinationFolder but doesn't move. And there, script shows error "An item with the same name already exists in this location."
global theWatchedFolder
global DestinationFolder
set theWatchedFolder to choose folder
set theDestinationFolder to choose folder
on idle
    tell application "Finder"
        set theDetectedItems to every item of theWatchedFolder
        repeat with aDetectedItem in theDetectedItems
            move aDetectedItem to the theDestinationFolder
        end repeat
    end tell
    if theDetectedItems ≠ {} then
        activate
        display dialog "Files for cutout were detected and moved to your " & theDestinationFolder
        tell application "Microsoft Outlook"
            set m to make new outgoing message with properties {subject:"Files For Cutout Received", content:"Hello there:
            Files for cutout received"}
            tell m
                make new recipient with properties {email address:{name:"KK", address:"[email protected]"}}
            end tell
            send m
        end tell
    end if
    return 1
end idle

Answer 1

Hi H:
Thanks for your help.
I opted the Option 1 from your script. When a file arrives in Watch Folder, the script still copies to the destination folder (instead of move) and sends email successfully, and this task repeats continuously. The script is as follows:
global theWatchedFolder
global theDestinationFolder
set theWatchedFolder to choose folder
set theDestinationFolder to choose folder
on idle
          tell application "Finder"
                    set theDetectedItems to every item of theWatchedFolder
                    repeat with aDetectedItem in theDetectedItems
                              set a to aDetectedItem as alias
                              set b to (move a to theDestinationFolder with replacing) as alias
                              if a ≠ b then
                                        tell current application
                                                  do shell script "rm -rf " & POSIX path of theWatchedFolder
                                        end tell
                              end if
                    end repeat
          end tell
          if theDetectedItems ≠ {} then
  activate
                    display dialog "Files for cutout were detected and moved to => " & theDestinationFolder
                    tell application "Microsoft Outlook"
                              set m to make new outgoing message with properties {subject:"Files For Cutout Received", content:"Hello there: Files for cutout received"}
                              tell m
  make new recipient with properties {email address:{name:"KK", address:"[email protected]"}}
                              end tell
  --open m
                              send m
                    end tell
          end if
          return 1
end idle