I don't think I've seen an Error 13 before. Does this help?
http://support.microsoft.com/kb/821292

That IIF looks like something from Access-world.
Maybe this will help:
http://www.access-programmers.co.uk/...ad.php?t=88805

Good luck,
Ryan---

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Ryan---
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"Ryan M-J" wrote:

it throws "Type Mismatch (13)" on the "for each" line only if the range is
strings, numbers work fine, but I need it to be strings

Dim addresses As String

For Each c In IIf(Range("C3").End(xlDown), Range("C3",
Range("C3").End(xlDown)), Range("C3"))
If addresses < "" Then
addresses = addresses & ", " & c.Value
Else
addresses = c.Value
End If
Next