Accessing Exchange OWA through pix 501

Hi there

I have an exchange server, it is behind a pix 501. i would like to access the exchange owa from the internet.
I have attempted to configure the pix but no luck.
The static internet ip is x.x.x.x
the exchange box is y.y.y.y

Any help with correcting the below configuration would be much appreciated.

Building configuration...
: Saved
:
PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password TqC9KLehNYt903ow encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname pixfirewall
domain-name ciscopix.com
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
names
name y.y.y.y Exchange
access-list inside_outbound_nat0_acl permit ip any 10.10.0.128 255.255.255.192
access-list inside_outbound_nat0_acl permit ip 10.10.0.0 255.255.255.0 10.10.0.128 255.255.255.192
access-list SFM_splitTunnelAcl permit ip 10.10.0.0 255.255.255.0 any
access-list outside_cryptomap_dyn_20 permit ip any 10.10.0.128 255.255.255.192
access-list outside_in permit tcp any interface outside eq https
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside x.x.x.x 255.255.255.0
ip address inside 10.10.0.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool VPN 10.10.0.151-10.10.0.160
pdm location 10.10.0.128 255.255.255.192 outside
pdm location Exchange 255.255.255.255 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp interface https Exchange https netmask 255.255.255.255 0 0
route outside 0.0.0.0 0.0.0.0 z.z.z.z 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 10.10.0.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto dynamic-map outside_dyn_map 20 match address outside_cryptomap_dyn_20
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
isakmp enable outside
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
vpngroup VPN address-pool VPN
vpngroup VPN dns-server c.c.c.c c.c.c.c
vpngroup VPN wins-server y.y.y.y
vpngroup VPN default-domain London
vpngroup VPN split-tunnel SFM_splitTunnelAcl
vpngroup VPN idle-time 1800
vpngroup VPN password ********
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 10.10.0.2-10.10.0.129 inside
dhcpd dns c.c.c.c
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd domain london
dhcpd auto_config outside
dhcpd enable inside
terminal width 80
Cryptochecksum:4bf1f16da205c9ce007f4a2280d38c6a
: end
[OK]

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