Copy sheet to new sheet
 

I am having a problem with excel 2007 with copying sheets. I can copy a
sheet repeatedly until I rename the sheet and then copy again. I get a
message that says the sheet I'm copying contains the name 'M' which already
exists in the new sheet. First, the sheet has not copied yet. Two, I have
searched the sheets and can find no formula or group of cells named 'M'.
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Thanks, Nick