Hi Don,
There isn't a mechanism in Office that deletes the Recently Used lists on a timed base. You may want to check with your firm's
administrator. They may have a 'task' setup to do this or there are 'registry cleaner' utilities that folks setup to 'clean up'
history related items on a periodic basis.
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How can I stop the recently used files from being deleted monthly?
Don @ Black Dog Architects>>
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Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*