Try using something other than Z: in your mapping.
Try X: , Y:, or Z:
The reason for this is that Z: is often used as a temporary mapping to \\DomainController\netlogon

If one of these other drive letters works, then you've found your problem.

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Paul Moxey
POS & Senior Network Administrator
Taubmans Pty Ltd
Paul_Moxey@taubmans.com.au

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Paul Moxey POS & Senior Network Administrator BarloworldCoatings (AUST) Pty Ltd