I've got an Excel file that links to two other files, runs some calculations
using VBA, and then creates an output file. Today, I started getting the
message "Excel cannot complete this task with available resources. Choose
less data or close other applications." during my run.

I know this isn't a physical memory issue (and this is borne out by looking
at the Task Manager), and I've read the article on Excel's inherent memory
limits. However, what I'm doing isn't new - I ran the exact same process with
different source files this morning and had no problems. It's worked fine for
months. I'm using the same PC and there've been no software changes (XL2003,
XP Pro).

When I run this process, I have no other Excel instances open.

Any ideas as to what else might be causing the issue? TIA.
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Hmm...they have the Internet on COMPUTERS now!