Okay, I misunderstood what you were trying to accomplish with the if statements initially and I apologize.

Try moving the variable declarations outside of the if statements.

#!/perl/bin/perl
use strict;
use warnings;
use Win32::OLE;
use Win32::OLE::Variant; #Needed for ReceivedTime constant.

my $Outlook = Win32::OLE->new('Outlook.Application');
my $namespace = $Outlook->GetNameSpace("MAPI");
my $recipient = $namespace->CreateRecipient("inboxname");

if ($recipient) {
    print "OK\n";
} else {
    print "$!\n";
}

$recipient->Resolve;  # see url


if ($recipient->Resolved) {
    print "Resolved\n";
} else {
    print "$!, unable to resolve\n";
}

my $p2 = $namespace->GetSharedDefaultFolder($recipient,6); # what does
+ this return?

if ($p2) {
    print "OK2\n";
} else {
    print "$!, Code fails here, does not return an error\n";
}
[download]

(Untested)

See also GetSharedDefaultFolder